Find the missing term: 6, 9, 15, 21, 33, ? MCQ with Answer and Explanation

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Find the missing term: 6, 9, 15, 21, 33, ?

A. 45

B. 39

C. 51

D. 42

Answer: Option B

Solution (By JKSSB Mock Tests)

These are products of 3 and consecutive primes: 2×3=6, 3×3=9, 5×3=15, 7×3=21, 11×3=33, so next is 13×3=39.

This question belongs to: Reasoning Mental Reasoning

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Practice More Mental Reasoning Questions

Question #1

Find the next term: 2, 3, 5, 7, 11, 13, ?

A. 15

B. 17

C. 23

D. 19

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Correct Answer: Option B

Explanation:
The series consists of consecutive prime numbers. The next prime after 13 is 17.

This question belongs to: Reasoning Mental Reasoning

Question #2

Find the missing term: 5, 7, 11, 19, 35, ?

A. 51

B. 67

C. 60

D. 65

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Correct Answer: Option B

Explanation:
Differences are +2, +4, +8, +16, each doubling; the next difference is +32, so 35+32=67.

This question belongs to: Reasoning Mental Reasoning

Question #3

Find the missing term: 100, 81, 64, 49, ?

A. 32

B. 35

C. 25

D. 36

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Correct Answer: Option D

Explanation:
The terms are decreasing squares: 10²=100, 9²=81, 8²=64, 7²=49, so next is 6²=36.

This question belongs to: Reasoning Mental Reasoning

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