Question

What are the common factors of 75, 60 and 210?

• A. 1, 3, 5, 15 and 25
• B. 1, 3, 5 and 15
• C. 1, 3, 15 and 25
• D. 3, 6 and 15

Answer 1

The correct option is B

1, 3, 5 and 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 of 75, 60 and 120 are 1, 3, 5 and 15.