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The GCF (Greatest Common Factor) of 1, 49, and 153 is 1, because 1 does not have any other factors.
The GCF is 1.
The GCF is: 1
The GCF is 9.
That would be 1. The only other factor of 49 is 7, and that doesn't work.
It is: 1
It is just 1