Four
Three factors.
9 has three factors: 1, 3, and 9.
Three factors
Three combinations: 23, 24 and 34
Nine factors.
9 has three factors.
Three factors.
Eight factors.
Three of them.
49 has three factors: 1, 7, 49
Three factors in common.
Three of them.
THREE
4
6 of them.
Two of them.
8 of them.