Find the missing term: 3, 7, 15, 31, 63, ? MCQ with Answer and Explanation

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Find the missing term: 3, 7, 15, 31, 63, ?

A. 131

B. 129

C. 125

D. 127

Answer: Option D

Solution (By JKSSB Mock Tests)

Each term is multiplied by 2 and 1 added: 3×2+1=7, 7×2+1=15, 15×2+1=31, 31×2+1=63, so 63×2+1=127.

This question belongs to: Reasoning Mental Reasoning

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Practice More Mental Reasoning Questions

Question #1

What is the next number in the series: 6, 11, 21, 40, 77, ?

A. 149

B. 152

C. 150

D. 151

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Correct Answer: Option A

Explanation:
Pattern: ×2 −1, ×2 −1, ×2 −2, ×2 −3, ×2 −5? 6×2−1=11, 11×2−1=21, 21×2−2=40, 40×2−3=77, 77×2−5=149 (subtracted numbers 1,1,2,3,5 Fibonacci).

This question belongs to: Reasoning Mental Reasoning

Question #2

Find the missing term: 3, 10, 29, 66, ?

A. 129

B. 125

C. 131

D. 127

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Correct Answer: Option D

Explanation:
The terms follow n³ + 2: 1³+2=3, 2³+2=10, 3³+2=29, 4³+2=66, so next is 5³+2=127.

This question belongs to: Reasoning Mental Reasoning

Question #3

Statements: No fruit is a vegetable. All mangoes are fruits. Conclusions: I. No mango is a vegetable. II. Some vegetables are mangoes. III. Some fruits are mangoes. Which conclusions follow?

A. Only I and III

B. All

C. Only I

D. Only II and III

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Correct Answer: Option A

Explanation:
Mangoes are fruits and no fruit is a vegetable, so no mango is a vegetable. Also, since all mangoes are fruits, some fruits are mangoes follows.

This question belongs to: Reasoning Mental Reasoning

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