Four pair of numbers are given, out of which three are same in a certain way. Find the odd pair that does not belong to the group?
Answer & explanation
Correct answer: option 4
Except option (4), all other are sum of first two digit.
9 + 3 = 12 , 7 + 8 = 15 , 3 + 6 = 9, 5 + 8 = 13