You need at least two numbers to find a GCF.
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The GCF is 3.
Since 39 is a factor of 78, it is automatically the GCF.
The GCF is 13.
The GCF is 13.
Factors of 39: 1 3 13 39 Factors of 26: 1 2 13 26 The GCF of 39 and 26 is 13