Find the odd one out: 2, 3, 5, 7, 9 MCQ with Answer and Explanation

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Find the odd one out: 2, 3, 5, 7, 9

A. 9

B. 2

C. 7

D. 3

Answer: Option A

Solution (By JKSSB Mock Tests)

9 is composite, while 2, 3, 5 and 7 are prime numbers.

This question belongs to: Reasoning Mental Reasoning

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Practice More Mental Reasoning Questions

Question #1

Find the missing term in the series: 2, 6, 12, 20, 30, ?

A. 44

B. 40

C. 42

D. 46

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Correct Answer: Option C

Explanation:
The pattern is n(n+1): 1×2=2, 2×3=6, 3×4=12, 4×5=20, 5×6=30, so the next term is 6×7=42.

This question belongs to: Reasoning Mental Reasoning

Question #2

If day after tomorrow is Sunday, what day was day before yesterday?

A. Wednesday

B. Monday

C. Tuesday

D. Thursday

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Correct Answer: Option A

Explanation:
If day after tomorrow is Sunday, today is Friday. Day before yesterday was Wednesday.

This question belongs to: Reasoning Mental Reasoning

Question #3

Find the missing number in the series: 8, 24, 12, 36, 18, 54, ?

A. 108

B. 72

C. 27

D. 68

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Correct Answer: Option C

Explanation:
Pattern: ×3, ÷2, ×3, ÷2, ×3, ÷2. 8×3=24, 24÷2=12, 12×3=36, 36÷2=18, 18×3=54, 54÷2=27.

This question belongs to: Reasoning Mental Reasoning

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