Which list contains only composite numbers?

6, 24, 51, 72, 105

12, 37, 54, 80, 117

31, 44, 57, 64, 92

26, 53, 66, 84, 96

Answer: A composite number can be divided into a whole number other than itself and one. A prime number can only be divided by itself and one.

Step-by-step explanation: Ex: 1,2,3,5,7,11,13, etc are prime. 4,6,8,9, etc are composite numbers. So ... the first list is correct because 6 (3*2), 24 (6*4), 51 (3*17), 105 (5*21) can all be multiplied by integers other than itself and one.