7 : 56 :: 9 : ? MCQ with Answer and Explanation

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7 : 56 :: 9 : ?

A. 72

B. 81

C. 90

D. 88

Answer: Option C

Solution (By JKSSB Mock Tests)

The relation is n(n+1). 7 × 8 = 56; 9 × 10 = 90.

This question belongs to: Reasoning Mental Reasoning

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Question #1

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Find the missing term: 2, 3, 6, 11, 18, ?

A. 25

B. 28

C. 26

D. 27

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Correct Answer: Option D

Explanation:
Differences are +1, +3, +5, +7, so next difference is +9: 18+9=27.

This question belongs to: Reasoning Mental Reasoning

Question #2

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Statements: All fruits are vegetables. All vegetables are plants. Conclusions: I. All fruits are plants. II. Some plants are vegetables.

A. Both follow

B. Neither follows

C. Only II follows

D. Only I follows

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Correct Answer: Option A

Explanation:
All fruits are vegetables and all vegetables are plants ⇒ All fruits are plants. Also some plants are vegetables (conversion of all vegetables are plants). Both follow.

This question belongs to: Reasoning Mental Reasoning

Question #3

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Find the missing term: 2, 3, 5, 9, 17, ?

A. 34

B. 32

C. 33

D. 31

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Correct Answer: Option C

Explanation:
Each term is multiplied by 2 and then 1 is subtracted: 2×2-1=3, 3×2-1=5, 5×2-1=9, 9×2-1=17, so next is 17×2-1=33.

This question belongs to: Reasoning Mental Reasoning

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