Complete the series: 5, 6, 9, 15, 25, ? MCQ with Answer and Explanation

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Complete the series: 5, 6, 9, 15, 25, ?

A. 41

B. 40

C. 45

D. 50

Answer: Option A

Solution (By JKSSB Mock Tests)

Pattern: +1, +3, +6, +10, +15 (triangular numbers). 25+16? Differences of differences +2,+3,+4,+5 so next difference +15? 1,3,6,10,15. Yes 25+15=40. Option A.

This question belongs to: Reasoning Mental Reasoning

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Practice More Mental Reasoning Questions

Question #1

In a queue of 30 people, Raj is 18th from the front. How many people are behind him?

A. 13

B. 12

C. 11

D. 10

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Correct Answer: Option B

Explanation:
People behind Raj = total - position from front = 30-18=12.

This question belongs to: Reasoning Mental Reasoning

Question #2

R is daughter of S. T is mother of S. U is father of T. How is R related to U?

A. Niece

B. Granddaughter

C. Great-granddaughter

D. Daughter

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Correct Answer: Option C

Explanation:
U is T's father, T is S's mother, and S is R's parent. So U is R's great-grandfather, making R his great-granddaughter.

This question belongs to: Reasoning Mental Reasoning

Question #3

Find the odd one out: 3, 5, 7, 12, 17, 19

A. 17

B. 12

C. 19

D. 7

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Correct Answer: Option B

Explanation:
All others are prime numbers while 12 is not.

This question belongs to: Reasoning Mental Reasoning

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