Find the odd man out of the series 5, 10, 17, 25

Option d: 25. Solution: Let's analyze the mathematical structure of the terms in the series: 5, 10, 17, 25 . Each correct term follows the pattern n2 + 1 for consecutive integers n ≥ 2 : - For n = 2 : 22 + 1 = 5 - For n = 3 : 32 + 1 = 10 - For n = 4 : 42 + 1 = 17 - For n = 5 : 52 + 1 = 26 (the series lists 25 , which is incorrect) The pattern of n2 + 1 is violated by 25 , which should be 26 . Therefore, 25 is the odd man out. Hence, Option D is the correct answer.

Find the odd man out of the series $5, 10, 17, 25$

The correct answer is Option d: $25$. Let's analyze the mathematical structure of the terms in the series: $5, 10, 17, 25$. Each correct term follows the pattern $n^2 + 1$ for consecutive integers $n \ge 2$: - For $n = 2$: $2^2 + 1 = 5$ - For $n = 3$: $3^2 + 1 = 10$ - For $n = 4$: $4^2 + 1 = 17$ - For $n = 5$: $5^2 + 1 = 26$ (the series lists $25$, which is incorrect) The pattern of $n^2 + 1$ is violated by $25$, which should be $26$. Therefore, $25$ is the odd man out. Hence, **Option D** is the correct answer.

Number Series, Coding and DecodingMCQMTP May 19 Series IIQuestion 2178 of 217

All Questions

Find the odd man out of the series $\displaystyle 5, 10, 17, 25$

Options

\displaystyle 5

\displaystyle 10

\displaystyle 17

\displaystyle 25

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

Correct Answer

✅ Option d — $\displaystyle 25$

All Options:

A $\displaystyle 5$
B $\displaystyle 10$
C $\displaystyle 17$
D $\displaystyle 25$

Detailed Solution & Explanation

Let's analyze the mathematical structure of the terms in the series:

\displaystyle 5, 10, 17, 25

.
Each correct term follows the pattern

\displaystyle n^2 + 1

for consecutive integers

\displaystyle n \ge 2

:
- For

\displaystyle n = 2

\displaystyle 2^2 + 1 = 5

- For

\displaystyle n = 3

\displaystyle 3^2 + 1 = 10

- For

\displaystyle n = 4

\displaystyle 4^2 + 1 = 17

- For

\displaystyle n = 5

\displaystyle 5^2 + 1 = 26

(the series lists

\displaystyle 25

, which is incorrect)

The pattern of

\displaystyle n^2 + 1

is violated by

\displaystyle 25

, which should be

\displaystyle 26

. Therefore,

\displaystyle 25

is the odd man out.

Hence, **Option D** 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 the odd man out of the series 5,10,17,25\displaystyle 5, 10, 17, 255,10,17,25

Options

Correct Answer

All Options:

Detailed Solution & Explanation

About This Chapter: Number Series, Coding and Decoding

Related Comparison Tables

More Questions from Number Series, Coding and Decoding

Ready to Master Number Series, Coding and Decoding?

Find the odd man out of the series $\displaystyle 5, 10, 17, 25$