Question

Which one of these numbers do not belong 21 15 6 16 27

Answer 1

16

Explanation:

21 divided by 3 is 7

15 divided by 3 is 5

6 divided by 3 is 2

27 divided by 3 is 9

and 16 divided by 3 is 5.33... which isn't similar to the ones above

Answer 2

That would be 16 because all the others are multiples of 3.