Concept:The odd number is the one that is not the product of two consecutive integers.Explanation:42=6×7, so it is a product of consecutive integers.72=8×9, so it is a product of consecutive integers.12=3×4, so it is a product of consecutive integers.62 cannot be written as n(n+1) for any integer n.Thus, 62 is different from the rest.Answer:The different number is 62, i.e. Option D.