Find the missing term: 1, 5, 14, 30, 55, ? MCQ with Answer and Explanation

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Find the missing term: 1, 5, 14, 30, 55, ?

A. 91

B. 85

C. 89

D. 95

Answer: Option A

Solution (By JKSSB Mock Tests)

Differences are 4, 9, 16, 25, i.e., 2², 3², 4², 5²; next difference is 6²=36, so 55+36=91.

This question belongs to: Reasoning Mental Reasoning

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Practice More Mental Reasoning Questions

Question #1

Find the missing term: 1, 8, 27, 64, ?

A. 125

B. 100

C. 121

D. 144

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Correct Answer: Option A

Explanation:
The terms are cubes: 1³=1, 2³=8, 3³=27, 4³=64, so next is 5³=125.

This question belongs to: Reasoning Mental Reasoning

Question #2

Find the odd one out: 3, 7, 11, 15, 19

A. 19

B. 15

C. 7

D. 11

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Correct Answer: Option B

Explanation:
All others are prime numbers; 15 is composite.

This question belongs to: Reasoning Mental Reasoning

Question #3

Find the missing term: 0, 7, 26, 63, ?

A. 127

B. 126

C. 125

D. 124

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Correct Answer: Option D

Explanation:
The terms follow n³-1: 1³-1=0, 2³-1=7, 3³-1=26, 4³-1=63, so next is 5³-1=124.

This question belongs to: Reasoning Mental Reasoning

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