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.
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Correct answer: (A) 67-469
Explanation
In 69, 81 and 87 both numbers are divisible by 3 (second = first × 7, a multiple of 21). In 67-469 neither 67 nor 469 is divisible by 3, so it is the odd pair.