Question
What are the common factors of 75, 60 and 210?
Answer: Option A
:
A
Factors of 75 are1, 3, 5,15, 25and 75.
Factors of 60 are1, 2, 3, 4, 5, 6, 10, 12, 15, 30and 60.
Factors of 210 are1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105 and 210.
∴Common factors of 75, 60 and 120 are1, 3, 5 and15.
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:
A
Factors of 75 are1, 3, 5,15, 25and 75.
Factors of 60 are1, 2, 3, 4, 5, 6, 10, 12, 15, 30and 60.
Factors of 210 are1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105 and 210.
∴Common factors of 75, 60 and 120 are1, 3, 5 and15.
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