In a certain code, '256' means 'you are good', '637' means 'we are bad' and '358' means 'good and bad'. Which digit stands for 'and'? MCQ with Answer and Explanation

In a certain code, '256' means 'you are good', '637' means 'we are bad' and '358' means 'good and bad'. Which digit stands for 'and'?
A. 2
B. 5
C. 8
D. 3
Answer: Option C
Solution (By JKSSB Mock Tests)
From first and third, good =5 or 6? 256 and 358 share 5. From second and third, bad =3 or 7 or 8 share 3. Thus good =5, bad =3. Then from third, and =8.

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Practice More Mental Reasoning Questions

Question #1
Find the odd one out: 64, 81, 100, 125, 144
A. 100
B. 64
C. 125
D. 144

Correct Answer: Option C


Explanation:
125 is a perfect cube, while all other options are perfect squares.

This question belongs to: Reasoning Mental Reasoning
Question #2
If 'RAT' is coded as 'IZG', then 'COW' is coded as?
A. WLD
B. XMD
C. XLD
D. XLE

Correct Answer: Option C


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
Question #3
Find the missing term: 1, 3, 7, 15, 31, ?
A. 62
B. 64
C. 65
D. 63

Correct Answer: Option D


Explanation:
Each term is double plus 1: 1×2+1=3, 3×2+1=7, 7×2+1=15, 15×2+1=31, so next is 31×2+1=63.

This question belongs to: Reasoning Mental Reasoning