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The GCF is 1.
The GCF of 5, 11 and 25 is 1. The GCF of 7, 23 and 52 is 1.
It is: 1
The GCF is 23.
The GCF is 2^3 x 5.
The GCF of each of those is 1.
The GCF is 25.