The four common factors are: 1, 3, 17, 51.
Five common factors.
Four factors in common.
8 common factors.
None. Common factors refer to factors that are common to two or more numbers. You have only one.
Four common factors.
Three factors in common.
Any of 39's factors can be common.
None recorded.
Two. The common factors are: 1, 2
Common factors of 28 and 34 are: 1 and 2.
None recorded.
7 has two factors, one and itself. For them to be common, they need to be compared to another set of factors.