Find the missing number: 5, 11, 24, 51, 106, ? MCQ with Answer and Explanation

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Find the missing number: 5, 11, 24, 51, 106, ?

A. 215

B. 219

C. 221

D. 217

Answer: Option D

Solution (By JKSSB Mock Tests)

Pattern: ×2 +1, ×2 +2, ×2 +3, ×2 +4, ×2 +5: 5×2+1=11, 11×2+2=24, 24×2+3=51, 51×2+4=106, 106×2+5=217.

This question belongs to: Reasoning Mental Reasoning

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Practice More Mental Reasoning Questions

Question #1

In a queue, Sita is 8th from the front and 13th from the back. How many persons are in the queue?

A. 20

B. 21

C. 19

D. 22

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Correct Answer: Option A

Explanation:
Total persons = 8 + 13 - 1 = 20.

This question belongs to: Reasoning Mental Reasoning

Question #2

Find the next number in the series: 1, 4, 27, 16, 125, 36, ?

A. 343

B. 216

C. 49

D. 64

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Correct Answer: Option A

Explanation:
Alternate cubes and squares: 1³, 2², 3³, 4², 5³, 6², 7³=343.

This question belongs to: Reasoning Mental Reasoning

Question #3

Find the missing term: 2, 4, 12, 48, ?

A. 120

B. 192

C. 240

D. 144

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Correct Answer: Option C

Explanation:
Multipliers are 2, 3, 4, 5: 2×2=4, 4×3=12, 12×4=48, so 48×5=240.

This question belongs to: Reasoning Mental Reasoning

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