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The greatest common factor (GCF, not GFC) of 315, 105 and 21 can be calculated by writing down each number's factors.

The factorization for the given numbers is:

315 = 3 x 3 x 5 x 7

105 = 3 x 5 x 7

21 = 3 x 7

The common factors are 3 x 7 = 21, so the GCF of 315, 105 and 21 is 21.

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12y ago

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