The GCF is: 49
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The GCF is 3.
The GCF is 7.
The GCF is 1.
The GCF is 147.
Since 21 is a factor of 147, it is automatically the GCF.
The GCF is 7.
The GCF is 1.
The GCF is 1.
The GCF is 21.
The GCF is: 3
The GCF is: 49
GCF(147, 189) = 21.