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Aspirants preparing for CAT 2024 should now concentrate on important topics like complex numbers and calendar-based aptitude questions, which often lead to confusion, particularly when differentiating between complex numbers and quadratic equations. Consistent practice and strong conceptual clarity are essential at this stage. Solving previous year questions and making use of helpful resources such as the calendar reasoning PDF can significantly enhance preparation and build confidence for the final exam.
Aspirants can also download questions on complex numbers with answers pdf for more practice questions and references for their studies.
Important Concept/Formula Used in CAT complex numbers questions
Concepts and Formulas Used in CAT complex numbers Exam questions are given below:
Contains real as well as imaginary parts.
Eg: 2+ 3i
Real part = 2
Imaginary part = 3
iota (i) = -1
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The complex conjugate of (a+ ib) is (a- ib).
CAT Previous Years Questions On Complex Numbers
Q1. CAT 2023 complex numbers Questions and Answers are given below:
If z is a complex number, then the minimum value of |z- 1| + |z + 1| is ______.
[Based on MBA Entrance Exams]
CAT complex numbers problems with solutions are given below:
Solution:
If z = a+ ib
Then, |z- 1| = a-12+b2
and |z + 1| = a+12+b2
|z- 1| + |z + 1| = a-12+b2 + a+12+b2
This value is minimum if either a= 1 and b =0 or a =0 and b = 1
So, the minimum value of |z- 1| + |z + 1| = 2.
Q2. Complex numbers Questions with solutions are given below:
If the cube roots of unity are 1, ω, ω2, then find the roots of the equation (x − 1)3 + 64 = 0. where ω = 3-1 [Practice Question]
Complex numbers system problems with answer for CAT exam are given below:
Solution:
(x − 1)3 = −64 ⇒ x − 1 = (−64)1/3
x − 1 = −4, −4ω, −4ω2
x = −3, 1 − 4ω, 1 − 4ω2
CAT Exam Important Topic: Strategy to Prepare “Complex Numbers” for CAT exam 2023 ( important complex number questions).
Find the CAT tips and tricks for complex numbers Questions below:
i4k = 1 (where k is a positive integer)
Learn algebra of complex numbers
Addition: N1= a1+ ib1; N2 = a2+ ib2; N1+ N2 = (a1+a2) +i(b1+ b2)
Subtraction: N1= a1+ ib1; N2 = a2+ ib2; N1- N2 = (a1-a2) +i(b1- b2)
Multiplication: N1 x N2 = (a1a2 + b1b2) + i(a1b2 + b1a2)
Division: N1/ N2 = (a1+ ib1)/(a2+ ib2)
Less frequently asked in the CAT Exam. Do not waste much time. Keep this topic for last.
Practice Previous years questions to get familiar with the types of questions being asked.
CAT entrance exam: Prerequisite to complex numbers questions
Basics of the number system
Imaginary Numbers
References to Study (Theory) complex numbers
NCERT Class 11
TriOsEducate: YouTube (https://www.youtube.com/watch?v=CwxDoiXb1D0)
References to Practice complex numbers questions for CAT exam
Study sources of Complex Numbers Questions for CAT Exam are given below:
How to Prepare Quantitative Aptitude by Arun Sharma (7th Edition)
( https://www.youtube.com/watch?v=VlEwd_dq-9s&t=2920s)
Practice Sample Papers
All the important tips of the calendar should be covered by the aspirants and for the aspirants Calendar reasoning questions with solutions are given below. Aspirants can also download calendar questions pdf and calendar reasoning questions pdf for more practice and references
CAT 2023 Syllabus Topic: Strategy to prepare “Concept of Calendar” and Calendar Aptitude Questions for CAT Exam
Important Concept/Formula Used in Calendar Questions for CAT Preparation
The concepts used in CAT calendar questions are given below:
Concept of odd days Number of days divided by 7 and the remainder is odd days.
Concept of leap year
Any year (Not multiple of 100) divisible by 4
Any year (multiple of 100) divisible by 400
Concept of finding a day on a given date.
Repetition of Calendar
Ordinary year after every 11 years (few exceptions)
Leap year after every 28 years (few exceptions)
CAT Calendar questions From CAT Previous Years Papers
Q1. CAT calendar questions are given below:
Given that 27th February 2003 is Thursday. What was the day on 27th February 1603? [CAT 2016]
Monday
Thursday
Sunday
Tuesday
Answer: [2]
After every 400 years, the calendar repeats itself. So, the answer is Thursday.
Q2. Calendar aptitude questions are given below:
Today is Monday. After 73 days, it will be [SNAP Sample Question]
Thursday
Friday
Saturday
Sunday
Calender reasoning questions with solutions are given below:
Ans: [1]
Divide 73 by 7, then odd days are 3.
So, 3 days after Monday will be Thursday.
Tips/Tricks for CAT on calendar based CAT questions
Tips and tricks: Calendar Questions for CAT Preparation are given below:
An ordinary year starts with and end on the same day.
A leap year-end with a day after it starts.
Odd days in a week is ‘0’.
A century can not end on Tuesday, Thursday or Saturday.
After every 400 years the calendar repeats.
Practice separately each kind of question.
Practice previous years questions from various MBA entrance Exams to get an idea of the pattern of questions being asked.
CAT entrance exam: Prerequisite to calendar reasoning questions
Knowledge of reading a calendar
Basics Calculations
CAT study material: References to Study (Theory) Concept of Calendar
R S Agrawal
Rodha
(https://www.youtube.com/watch?v=fnGRCej5qUw)
CAT study material: References to Practice ( calendar questions for CAT preparation)
Study sources of calendar aptitude questions for CAT exam are given below:
MBA Entrance Previous years Papers and Sample Papers.
Unacademy CAT
(https://www.youtube.com/results?search_query=calendars+for+CAT+Exam)
CAT Exam Important Topic: Strategy to Prepare “Statement and Conclusions” (Critical Reasoning) for CAT-2023
Important Concept of CAT Statement and Conclusions questions
The concepts used in Statement and Conclusions CAT questions are given below:
The question has three parts
Statement + Question+ Options (Conclusions)
Statement: A statement is a formal account of certain facts, views or situations in words.
Conclusions:
CAT Practice Questions on Statements and Conclusions (critical reasoning questions for CAT)
Question 1: Statements and Conclusions (critical reasoning questions for CAT) are given below:
Read the passage and answer the questions based on it. (CAT 2017)
Typewriters are the epitome of a technology that has been comprehensively rendered obsolete by the digital age. The ink comes off the ribbon, they weigh a ton, and second thoughts are a disaster. But they are also personal, portable and, above all, private. Type a document and lock it away and more or less the only way anyone else can get it is if you give it to them. That is why the Russians have decided to go back to typewriters in some government offices, and why in the US, some departments have never abandoned them. Yet it is not just their resistance to algorithms and secret surveillance that keeps typewriter production lines - well one, at least - in business (the last British one closed a year ago). Nor is it only the nostalgic appeal of the metal body and the stout well-defined keys that make them popular on eBay. A typewriter demands something particular: attentiveness. By the time the paper is loaded, the ribbon tightened, the carriage returned, the spacing and the margins set, there's a big premium on hitting the right key. That means sorting out ideas, pulling together a kind of order and organising details before actually striking off. There can be no thinking on screen with a typewriter. Nor are there any easy distractions. No online shopping. No urgent emails. No Twitter. No need even for electricity - perfect for writing in a remote hideaway. The thinking process is accompanied by the encouraging clack of keys, and the ratchet of the carriage return. Ping!
Question. Which one of the following best describes what the passage is trying to do?
It describes why people continue to use typewriters even in the digital age.
It argues that typewriters will continue to be used even though they are an obsolete technology.
It highlights the personal benefits of using typewriters.
It shows that computers offer fewer options than typewriters.
Ans: [1]
Explanation:
The author is trying to explain:
why the typewriter continues to be used even in today's digital age. For this, he has given reasons that typewriters are personal and private and cannot be hacked. These can be used anywhere without the requirement of electricity.
Q2. CAT exam 2023 statements and Conclusions questions with solutions are given below:
Comprehension: [CAT 2018]
[The] Indian government [has] announced an international competition to design a National War Memorial in New Delhi, to honour all of the Indian soldiers who served in the various wars and counter-insurgency campaigns from 1947 onwards. The terms of the competition also specified that the new structure would be built adjacent to the India Gate – a memorial to the Indian soldiers who died in the First World War. Between the old imperialist memorial and the proposed nationalist one, India’s contribution to the Second World War is airbrushed out of existence.
The Indian government’s conception of the war memorial was not merely absent-minded. Rather, it accurately reflected the fact that both academic history and popular memory have yet to come to terms with India’s Second World War, which continues to be seen as little more than mood music in the drama of India’s advance towards independence and partition in 1947. Further, the political trajectory of the postwar subcontinent has militated against popular remembrance of the war. With partition and the onset of the India-Pakistan rivalry, both of the new nations needed fresh stories for self-legitimisation rather than focusing on shared wartime experiences.
However, the Second World War played a crucial role in both the independence and partition of India. . . . The Indian army recruited, trained and deployed some 2.5 million men, almost 90,000 of which were killed and many more injured. Even at the time, it was recognised as the largest volunteer force in the war. . . .
India’s material and financial contribution to the war was equally significant. India emerged as a major military-industrial and logistical base for Allied operations in Southeast Asia and the Middle East. This led the United States to take considerable interest in the country’s future and ensured that this was no longer the preserve of the British government.
Other wartime developments pointed in the direction of India’s independence. In a stunning reversal of its long-standing financial relationship with Britain, India finished the war as one of the largest creditors to the imperial power.
Such extraordinary mobilization for war was achieved at a great human cost, with the Bengal famine the most extreme manifestation of widespread wartime deprivation. The costs on India’s home front must be counted in millions of lives.
Indians signed up to serve on the war and home fronts for a variety of reasons. . . . [M]any were convinced that their contribution would open the doors to India’s freedom. . . . The political and social churn triggered by the war was evident in the massive waves of popular protest and unrest that washed over rural and urban India in the aftermath of the conflict. This turmoil was crucial in persuading the Attlee government to rid itself of the incubus of ruling India. . . .
Seventy years on, it is time that India engaged with the complex legacies of the Second World War. Bringing the war into the ambit of the new national memorial would be a fitting – if not overdue – recognition that this was India’s War.
Question: In the first paragraph, the author laments the fact that
Ans: [2]
In the first paragraph, the author says that ‘India’s contribution to the second world war is airbrushed out of existence.’ This means, there is no recognition of the Indian soldiers’ contribution to the second world war.
Tips and Tricks for Statement and Conclusions questions for CAT exam 2023
Conclusions are not generalised.
Conclusions have to be “No exception at all”.
Understand the difference between Inference and Conclusion
Rephrase the question in your words.
Generally, indirect questions are asked in CAT Exam (generally in the RCs). So, Practice different RCs appeared in CAT Exam.
Practice questions daily (Fewer questions but daily)
CAT 2023: Prerequisite to Statement and Conclusions
Knowledge of basic components of statements and arguments.
Reading Skills.
References to Study (Theory) Statement and Conclusions for CAT
How to Prepare for Verbal Ability and Reading Comprehension for CAT | 9th Edition Book by Arun Sharma and Meenakshi Upadhyay
Rodha (YouTube: https://www.youtube.com/watch?v=EL9hYXQteUU)
References to Practise CAT Questions on Statement and Conclusions
Verbal Reasoning by Disha Experts (kindle)
Unacademy CAT4MBA
(https://www.youtube.com/watch?v=p1KwwOjk-zI)
Complex number questions in the CAT exam often appear in the Quantitative Aptitude section and can be solved quickly with the right approach. Here are six effective tricks to simplify your preparation:
1. Use i2=−1i^2 = -1i2=−1 Efficiently
Always reduce powers of iii using:
i1=ii^1 = ii1=i,
i2=−1i^2 = -1i2=−1,
i3=−ii^3 = -ii3=−i,
i4=1i^4 = 1i4=1.
Repeat this cycle to simplify powers of iii instantly.
2. Convert to Polar Form When Multiplying
For multiplication or division of complex numbers, convert them to polar form:
z=r(cosθ+isinθ)z = r(\cos \theta + i \sin \theta)z=r(cosθ+isinθ).
Use De Moivre’s Theorem to handle powers and roots easily.
3. Use Conjugates to Simplify Divisions
To divide complex numbers, multiply numerator and denominator by the conjugate of the denominator to eliminate the imaginary part from the denominator.
4. Apply Modulus for Distance-Based Questions
Use modulus ∣z∣=x2+y2|z| = \sqrt{x^2 + y^2}∣z∣=x2+y2 for any complex number z=x+iyz = x + iyz=x+iy. This is helpful in geometry-based or coordinate format questions.
5. Visualise on the Argand Plane
Plotting complex numbers on the Argand plane (real vs. imaginary axes) can simplify addition, subtraction, and understanding geometrical relationships like collinearity or symmetry.
6. Use Properties of Roots of Quadratic Equations
If a quadratic equation has complex roots, use the identity:
If zzz is a root, the conjugate zˉ\bar{z}zˉ is also a root. This helps in quickly identifying missing roots or verifying options.
Calendar-based puzzles in CAT test logical reasoning and date-based calculations. With smart shortcuts, you can solve them quickly and accurately. Here are six effective tricks to tackle calendar questions with ease:
1. Memorise Odd Days of Each Month
Know how many odd days each month contributes:
Jan: 3, Feb: 0/1 (non-leap/leap), Mar: 3, Apr: 2, etc.
Use this to calculate the day of the week efficiently.
2. Use the “Odd Days” Concept for Day Calculations
Total days ÷ 7 = Quotient + Remainder
The remainder gives the odd days, which determine the day of the week. For example, 3 odd days after Sunday means Wednesday.
3. Learn Century Code Tricks
Each century has a fixed code:
1600s: 6, 1700s: 4, 1800s: 2, 1900s: 0, 2000s: 6.
This helps in quickly determining the base weekday for any date.
4. Zeller’s Rule Shortcut
Use Zeller’s Congruence Formula for exact day calculation, or its simplified version if you're comfortable with modular arithmetic.
5. Check Leap Year Pattern
A year is a leap year if divisible by 4 (but not 100 unless also divisible by 400). This affects February and must be considered in day calculations.
6. Use Date Reversal Logic
Some puzzles ask about days like “what day is it 100 days from now?” Quickly find the remainder when divided by 7 and count forward using odd days logic.
Practice, stay focused, and we'll be back tomorrow with Day 55 CAT Preparation Tips.
Thank You. All the Best!
In mathematics, a complex number is an element of a number system that extends the real numbers with a particular element labeled i, known as the imaginary unit, and satisfies the equation; every complex number may be represented in the form a+bi, where a, and b are real numbers.
Complex numbers are those that have both real and imaginary parts. Complex number problems on the CAT examine your knowledge of equations and mathematics. Knowing this subject may help you answer difficult problems quickly, which is critical for scoring well.
Many candidates mix up complex numbers with quadratic equations. To prevent misunderstanding, review each subject independently and understand their distinct features. Practice answering a lot of questions for more clarity.
Here are some useful tips. For complex numbers, concentrate on learning crucial formulae and learning shortcuts to save time. For calendar questions, master particular strategies such as determining the day of the week for a given date. Regular practice will help you become more efficient and accurate.
PYQs help you understand the sorts of questions that have previously been asked, as well as their degree of complexity. Solving these will give you an idea of what to anticipate and help you prepare for similar critical thinking questions on the CAT Exam.
Complex numbers are frequently tested in the Quantitative Aptitude section. Questions may involve basic properties, powers of i, conjugates, and modulus
Use tricks like the odd days method, century codes, and leap year rules. These shortcuts help you determine the day of the week or solve date-based puzzles quickly and accurately.
Focus on understanding their distinct properties: quadratic equations may have complex roots, but complex numbers involve operations on real and imaginary parts. Practice problems involving both to clarify differences.
PYQs offer insight into the type and pattern of logical reasoning questions CAT typically asks. Regular practice with them helps build familiarity and speed in tackling critical reasoning problems.
Utilise curated PDFs, topic-wise question banks, and online mock tests. Careers360’s calendar reasoning PDF and targeted exercises on complex numbers and reasoning are great tools to reinforce concepts.
Hello,
Yes, with a 622 rank in IPU CET for MBA and being a Delhi candidate, you have a good chance of getting admission in MAIT (Maharaja Agrasen Institute of Technology).
You don’t need to worry about not giving the CAT exam. IPU CET rank is enough for admission in MAIT under the CET quota.
Just make sure to keep MAIT high in your preference list during counselling.
Hope it helps !
Yes, candidates who qualify in CUSAT CAT can gain admission to various participating institutes based on their rank. These include engineering colleges associated with CUSAT, such as its own School of Engineering in Kochi, Model Engineering College, and over 20 government and private engineering colleges across Kerala like College of Engineering Thrikkaripur, Co-operative Institute of Technology Vadakara, and MG College of Engineering Thiruvallam. The final seat allotment is based on your rank and your choice of program during the counselling process.
Hello Ashish,
Yes, you can get admission to MBA programs at IISWBM without a CAT score, but only for certain courses. Note that IISWBM has MBA programs under the University of Calcutta and flagship courses like MBA (Day) or MBA-HRM typically require a CAT score. Other programs like the PGDM or Executive MBA/Course may have other entrance examinations on which consideration would be made, or considerations may be based on merit, and of course work experience. Always run any eligibility detail checks with the official IISWBM (https://www.iiswbm.edu/) website or The IISWBM prospectus.
Hello,
Yes, a state (Delhi) NC-OBC certificate is valid for CAT 2025 , but it must be in the central government format (for appointment to posts under Government of India).
Also, it should be issued after 31st March 2025, as required by IIMs. If your certificate meets these conditions, it will be accepted.
Hope it helps !
Hello aspirant,
With 375 marks and an AIR of around 2.6 lakh in NEET 2025, getting admission to Ayurvedic & Unani Tibbia College (AUTC), New Delhi under the state quota is quite difficult. The cutoffs for government BAMS seats in AUTC generally stay below AIR 50,000, especially for the General and EWS categories. Your score may not meet the cutoff in the first or second rounds, but you might still have a slim chance in the mop-up or stray vacancy rounds, depending on how many seats remain and how other candidates opt. If you're a Delhi domicile and have all your documents ready, you should definitely apply and fill AUTC as a top choice. It’s also good to keep backup options in other AYUSH colleges open.
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