What will come in place of the question mark (?) in the following number series? 9, 16, 25, 36, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 9, 16, 25, 36, ?

A. 49

B. 64

C. 42

D. 81

Answer: Option A

Solution (By JKSSB Mock Tests)

The series consists of squares of consecutive integers starting from 3: 3², 4², 5², 6². The next term is 7²=49.

This question belongs to: Reasoning Number Series

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Question #1

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What will come in place of the question mark (?) in the following number series? 2, 12, 36, 80, ?

A. 180

B. 170

C. 160

D. 150

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Correct Answer: Option D

Explanation:
The pattern is: 1×2=2, 2×6=12, 3×12=36, 4×20=80. The multipliers are 2,6,12,20 which are n(n+1) for n=1,2,3,4. For n=5, 5×30=150.

This question belongs to: Reasoning Number Series

Question #2

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What will come in place of the question mark (?) in the following number series? 7, 8, 10, 13, 17, ?

A. 22

B. 21

C. 20

D. 23

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Correct Answer: Option A

Explanation:
The differences are: 1, 2, 3, 4. The next difference is 5. Therefore, 17+5=22.

This question belongs to: Reasoning Number Series

Question #3

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What will come in place of the question mark (?) in the following number series? 3, 7, 15, 31, ?

A. 65

B. 67

C. 61

D. 63

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Correct Answer: Option D

Explanation:
Each term is obtained by multiplying by 2 and adding 1. (3×2)+1=7, (7×2)+1=15, (15×2)+1=31. The next term is (31×2)+1=63.

This question belongs to: Reasoning Number Series

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