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Three of the following four are alike in a certain way and thus form a group. Which is the one that does NOT belong to that group? NOTE: Operations
Question

Three of the following four are alike in a certain way and thus form a group. Which is the one that does NOT belong to that group?
NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 - Operations on 13 such as adding/deleting/ multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed)
(A) 56-7
(B) 169-13
(C) 729-27
(D) 121-11

A.

C

B.

A

C.

B

D.

D

Correct option is B

Logic: First number is square of second number.
Explanation:
56 = 7 × 8 (not a perfect square of 7) 
169 = 13²
729 = 27² 
121 = 11² 
In B, C, D → First number = (Second number)²
Only A does not follow this pattern. Which is given option B.
Final Answer:
56 – 7
Final Correct Option:
(B)

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