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Anonymous
13 is a Prime number which does not divide evenly into 42 so the GCF is 1
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gcf of 13 and 42 is 1.
The GCF is 21.
The GCF of 42 and 35 is 7.factors of 42: 2,6,7factors of 35: 5,7
The GCF is 6.
The GCF is 2.