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.

Explanation

Each number-pair has second number = first number × 7 (69 → 483, 81 → 567, 87 → 609, 67 → 469). In pairs 2, 3 and 4 the first number (69, 81, 87) is a multiple of 3, but 67 is not. So 67-469 is different, as per the official key.