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.
Answer & explanation
Correct answer: option 2
9 : 90 = 90 is completely divisible by 9
8 : 66 = 66 is not completely divisible by 8
7 : 56 = 56 is completely divisible by 7
5 : 30 = 30 is completely divisible by 5