Find the missing term: 10, 20, 40, 80, 160, ? MCQ with Answer and Explanation

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Find the missing term: 10, 20, 40, 80, 160, ?

A. 320

B. 300

C. 280

D. 240

Answer: Option A

Solution (By JKSSB Mock Tests)

Each term is multiplied by 2: 10×2=20, 20×2=40, 40×2=80, 80×2=160, so 160×2=320.

This question belongs to: Reasoning Mental Reasoning

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Practice More Mental Reasoning Questions

Question #1

Find the missing term: 1, 2, 5, 10, 17, 26, ?

A. 37

B. 38

C. 36

D. 35

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Correct Answer: Option A

Explanation:
Differences are +1, +3, +5, +7, +9, so next difference is +11: 26+11=37.

This question belongs to: Reasoning Mental Reasoning

Question #2

In a row of boys, A is 5th from the left and B is 8th from the right. If they interchange positions, A becomes 15th from the left. How many boys are in the row?

A. 23

B. 20

C. 21

D. 22

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Correct Answer: Option D

Explanation:
A's new position from left is 15, which is B's original position from left. Total = B's left position + B's right position - 1 = 15 + 8 - 1 = 22.

This question belongs to: Reasoning Mental Reasoning

Question #3

Find the missing term: 1, 2, 6, 24, ?

A. 60

B. 120

C. 110

D. 96

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Correct Answer: Option B

Explanation:
The terms are factorials: 1!=1, 2!=2, 3!=6, 4!=24, so next is 5!=120.

This question belongs to: Reasoning Mental Reasoning

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