What is the common factor of 75 48 and 32?

The factors of 32 are:

1, 2, 4, 8, 16, 32

The factors of 48 are:

1, 2, 3, 4, 6, 8, 12, 16, 24, 48

The factors of 75 are:

1, 3, 5, 15, 25, 75

The common factor is:

1