Three of the following four number-pairs are alike in a certain way and thus form a group. Which is the pair 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 1and 3 is not allowed.)
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 11-89.
Logic: First number multiplied by 9 to get the second number
13 × 9 = 117
All follow the same logic except option 2.