Question

The following product is a complete decomposition into prime factors:

12 = 2 × 2 × 3
14 = 2 × 7
16 = 4 × 4
42 = 6 × 7
42 = 2 × 3 × 7
63 = 3 × 21

Answer 1

16 = 2 x 2 x 2 x 2
42 = 3 x 2 x 7
63 = 3 x 3 x 7

Answer 2

12 is correct
14 is correct
16 = 2x2x2x2
42 is correct
63 = 3x3x7

Answer 3

4, 6, 21 are not prime factors