Four number-pairs have been given, out of which three are alike in some manner and one is different. Select the number-pair that is different.

8 : 34 5 : 24 6 : 26 7 : 30

5 : 24

The logic followed here is : 8 : 34 → 8 × 4 + 2 = 34 5 : 24 → 5 × 4 + 2 = 22 ≠ 24 (odd) 6 : 26 → 6 × 4 + 2 = 26 7 : 30 → 7 × 4 + 2 = 30