Three of the following four number triads are alike in a certain way and thus form a group. Which is the number triad 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. 31 - 46 - 41.
Logic: First number + 9 = Third number, Third number + 6 = Second number
1) 31 - 46 - 41 → 31 + 9 = 40 ≠ 41, 40 + 6 = 46
2) 29 - 44 - 38 → 29 + 9 = 38, 38 + 6 = 44
3) 24 - 39 - 33 → 24 + 9 = 33, 33 + 6 = 39
4) 17 - 32 - 26 → 17 + 9 = 26, 26 + 6 = 32
Thus, the number triad that does not belong to that group is 31 - 46 - 41.