14 and 28, among others.
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The GCF is 7.
14, 28, 42
Nope - 14 is not a factor of 100 or 200. The GCF of all three numbers is 20 !
You need at least two numbers to find a GCF. If that's 42, 70 and 84, the GCF is 14.
Since 79 is a prime number, the greatest common factor of the numbers 79 and 14 is 1.