Three of the following four options 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/subtracting/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.)
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 86 - 41 - 38.
The logic followed here is: (1st number + 3rd number) ÷ 3 = 2nd number.
1) 86 - 41 - 38 → (86 + 38) ÷ 3 = 124 ÷ 3 = 41.3 ≠ 41
2) 118 - 93 - 161 → (118 + 161) ÷ 3 = 279 ÷ 3 = 93
3) 33 - 15 - 12 - (33 + 12) ÷ 3 = 45 ÷ 3 = 15
4) 52 - 36 - 56 → (52 + 56) ÷ 3 = 108 ÷ 3 = 36