Find the missing term: 1, 3, 7, 15, 31, ? MCQ with Answer and Explanation

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Find the missing term: 1, 3, 7, 15, 31, ?

A. 63

B. 65

C. 64

D. 62

Answer: Option A

Solution (By JKSSB Mock Tests)

Each term is double plus 1: 1×2+1=3, 3×2+1=7, 7×2+1=15, 15×2+1=31, so next is 31×2+1=63.

This question belongs to: Reasoning Mental Reasoning

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Practice More Mental Reasoning Questions

Question #1

If today is Friday, what day will it be after 100 days?

A. Tuesday

B. Monday

C. Sunday

D. Saturday

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Correct Answer: Option C

Explanation:
100 divided by 7 leaves remainder 2. Friday + 2 = Sunday.

This question belongs to: Reasoning Mental Reasoning

Question #2

If 'CAT' is coded as 'XZG', then 'DOG' is coded as?

A. WLS

B. WMT

C. WLT

D. VLT

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Correct Answer: Option C

Explanation:
Each letter is replaced by its reverse letter (A↔Z, B↔Y, C↔X). D→W, O→L, G→T, so DOG = WLT.

This question belongs to: Reasoning Mental Reasoning

Question #3

Find the missing term: 2, 9, 28, 65, ?

A. 126

B. 127

C. 125

D. 124

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Correct Answer: Option A

Explanation:
The terms follow n³+1: 1³+1=2, 2³+1=9, 3³+1=28, 4³+1=65, so next is 5³+1=126.

This question belongs to: Reasoning Mental Reasoning

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