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Anonymous
1 because 13 is a Prime number
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The GCF of 9 and 12 is 3
gcf(9, 8) =1 gcf(9, 12) = 3 gcf(8, 12) = 4 gcf(9, 8, 12) = 1
The GCF is 3.
The GCF of 9, 12, 15 is 3.