Question

Find the common factors of 75, 60, and 210.

Answer 1

Factors of 75 are 1, 3, 5, 15, 25, and 75.

Factors of 60 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 30, and 60.

Factors of 210 are 1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105, and 210.
Thus, common factors of 75, 60, and 210 are 1, 3, 5, and 15.