Question

The common factors of 75, 60 and 210 are:

• A. 1, 3, 5, 15
• B. 1, 3, 5, 15, 25
• C. 1, 3, 15, 25
• D. 3, 5, 15

Answer 1

The correct option is A

1, 3, 5, 15

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.

∴ Common factors = 1, 3, 5, 15