Find the odd one out: 2, 9, 28, 65, 126, 217 MCQ with Answer and Explanation

Find the odd one out: 2, 9, 28, 65, 126, 217
A. 65
B. 28
C. 126
D. 9
Answer: Option D
Solution (By JKSSB Mock Tests)
Pattern n³+1: 1³+1=2, 2³+1=9, 3³+1=28, 4³+1=65, 5³+1=126, 6³+1=217. All fit. No odd. Wait, all follow. Perhaps 2=1³+1,9=2³+1 yes. Maybe different series. For odd, perhaps one that does not fit a different pattern.

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Practice More Mental Reasoning Questions

Question #1
If PEN is coded as QFO, how is TIN coded?
A. VJO
B. UJP
C. UJO
D. VJP

Correct Answer: Option C


Explanation:
Each letter is shifted forward by 1: P→Q, E→F, N→O; so T→U, I→J, N→O, giving UJO.

This question belongs to: Reasoning Mental Reasoning
Question #2
Find the missing term: 10, 18, 34, 66, ?
A. 130
B. 126
C. 128
D. 132

Correct Answer: Option A


Explanation:
Each term is multiplied by 2 and 2 is subtracted: 10×2-2=18, 18×2-2=34, 34×2-2=66, so next is 66×2-2=130.

This question belongs to: Reasoning Mental Reasoning
Question #3
Find the odd one out: 3, 5, 11, 14, 17, 21
A. 17
B. 14
C. 3
D. 21

Correct Answer: Option B


Explanation:
All numbers except 14 are prime numbers. 14 is composite. Hence 14 is the odd one out.

This question belongs to: Reasoning Mental Reasoning