Four number-pairs have been given, out of which three are alike in some manner and one is different. Select the one that is different.
(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.)
15 : 126
27 : 234
31 : 270
17 : 162
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 17: 162.
15 : 126 → 15 9 - 9 = 135 - 9 = 126
27 : 234 → 27 9 - 9 = 243 - 9 = 234
31 : 270 → 31 9 - 9 = 279 - 9 = 270
17 : 162 → 17 9 - 9 = 153 - 9 = 144 ≠ 162
All are following the same logic except option 1.