0
Best Answer
3
To clarify:
The prime factors of 45 are 3, 3, and 5 (or 32, 5.)
The prime factors of 60 are 2, 2, 3, and 5 (or 22, 3, 5.)
Therefore, the common factors are 1, 3, 5, and 15, while the common prime factors are only 3 and 5.
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