Find odd one out of the series: 16, 25, 36, 72, 144, 196 and 225 .

Option b: 72. Solution: Let's check the perfect square property for each number in the series: - 16 = 42 - 25 = 52 - 36 = 62 - 144 = 122 - 196 = 142 - 225 = 152 - 72 is not a perfect square ( 82 = 64 and 92 = 81 ). Since 72 is the only term that is not a perfect square, it is the odd man out. Hence, Option B is the correct answer.

Find odd one out of the series: $16, 25, 36, 72, 144, 196$ and $225$.

The correct answer is Option b: 72. Let's check the perfect square property for each number in the series: - $16 = 4^2$ - $25 = 5^2$ - $36 = 6^2$ - $144 = 12^2$ - $196 = 14^2$ - $225 = 15^2$ - $72$ is not a perfect square ($8^2 = 64$ and $9^2 = 81$). Since $72$ is the only term that is not a perfect square, it is the odd man out. Hence, **Option B** is the correct answer.

Number Series, Coding and DecodingMCQPYQ Dec 23Question 2172 of 217

All Questions

Find odd one out of the series: $\displaystyle 16, 25, 36, 72, 144, 196$ and $\displaystyle 225$ .

Options

A36

B72

C196

D225

For any discrepancies in this question, email contact@cadada.in

Correct Answer

✅ Option b — 72

All Options:

A36
B72
C196
D225

Detailed Solution & Explanation

Let's check the perfect square property for each number in the series:
-

\displaystyle 16 = 4^2

\displaystyle 25 = 5^2

\displaystyle 36 = 6^2

\displaystyle 144 = 12^2

\displaystyle 196 = 14^2

\displaystyle 225 = 15^2

\displaystyle 72

is not a perfect square (

\displaystyle 8^2 = 64

and

\displaystyle 9^2 = 81

).

Since

\displaystyle 72

is the only term that is not a perfect square, it is the odd man out.

Hence, **Option B** is the correct answer.

About This Chapter: Number Series, Coding and Decoding

Paper

Paper 3: Quantitative Aptitude

Weightage

5 Marks

Key Topics

Number series, Coding & Decoding, Odd man out

This chapter covers Number series, Coding & Decoding, Odd man out and is part of Paper 3: Quantitative Aptitude in the CA Foundation exam.

View Official ICAI Syllabus

Exam Strategy Tip

This topic carries 5 Marks weightage. Focus on understanding core concepts rather than memorizing.

Related Comparison Tables

Cardinal vs Ordinal Utility: Measuring Satisfaction Promissory Note vs Bill of Exchange: Negotiable Instruments

Ready to Master Number Series, Coding and Decoding?

Practice all 217 questions with instant feedback, earn XP, track your streaks, and ace your CA Foundation exam.

Start Practicing — It's Free

Find odd one out of the series: 16,25,36,72,144,196\displaystyle 16, 25, 36, 72, 144, 19616,25,36,72,144,196 and 225\displaystyle 225225.