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?

1 – 4 – 9  9 – 12 – 17 17 – 20 – 24 81 – 84 – 89

17 – 20 – 24

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