The factors of 72 are __________________.
5, 7, 11, 13, 15, 16, 17, 20, and 25
1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36 and 72
5, 7, 13, 14, 15, 16, 17 and 19
5, 7, 10, 11, 13, 17, 21 and 23
72=1×72
=2×36
=3×24
=4×18
=6×12
=8×9
Factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36 and 72.
The factors of a2+b−ab−a are :