If 2 is coded as 3, 3 as 8, 4 as 15, then 5 is coded as? MCQ with Answer and Explanation

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If 2 is coded as 3, 3 as 8, 4 as 15, then 5 is coded as?

A. 20

B. 22

C. 24

D. 26

Answer: Option C

Solution (By JKSSB Mock Tests)

The code is n²-1: 2²-1=3, 3²-1=8, 4²-1=15, so 5²-1=24.

This question belongs to: Reasoning Mental Reasoning

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Practice More Mental Reasoning Questions

Question #1

Find the missing term: 5, 11, 23, 47, 95, ?

A. 188

B. 191

C. 187

D. 189

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Correct Answer: Option B

Explanation:
Each term is multiplied by 2 and 1 is added: 5×2+1=11, 11×2+1=23, 23×2+1=47, 47×2+1=95, so next is 95×2+1=191.

This question belongs to: Reasoning Mental Reasoning

Question #2

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

A. 120

B. 144

C. 240

D. 192

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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

Question #3

If 'RAT' is coded as 'IZG', then 'COW' is coded as?

A. XLD

B. XMD

C. XLE

D. WLD

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Correct Answer: Option A

Explanation:
Reverse letter coding: R→I, A→Z, T→G; C→X, O→L, W→D, so COW = XLD.

This question belongs to: Reasoning Mental Reasoning

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