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 3
1 → +3 → 4 → +5 → 9,
9 → +3 → 12 → +5 → 17,
17 → +3 → 20 → +4 → 24,which is odd
81 → +3 → 84 → +5 → 89