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Answered 2017-11-28 01:24:03

The greatest common factor (GCF) of 42 and 63 is 21.

To find the GCF (greatest common factor) of two numbers, first prime factorize them.

42 = 2*3*7

63 = 3*3*7

The GCF must be able to contain factors such that if divided by 42 or 63, the answer will be an integer.

The GCF is 21.
21

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Answered 2009-11-29 15:38:16

21.

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