The common factors of 75, 60 and 210 are -
1, 3, 5, 15
Factors of 75 = 1, 3, 5, 15, 25 and 75
Factors of 60= 1, 2, 3, 4, 5, 6, 10, 12, 15, 30 and 60
Factors of 210 = 1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105 and 210
∴ Common factors = 1, 3, 5,15