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: B
Explanation
The correct answer is option 2 i.e. 76 - 67 - 54.
The pattern followed is:
1) 112 - 103 - 94 → 112 - 9 = 103, 103 - 9 = 94
2) 76 - 67 - 54 → 76 - 9 = 67, 67 - 9 = 58 ≠ 54
3) 94 - 85 - 76 → 94 - 9 = 85, 85 - 9 = 76
4) 87 - 78 - 69 → 87 - 9 = 78, 78 - 9 = 69
Thus, 76 - 67 - 54 does not follow the pattern.