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The GCF is 2.
GCF(25, 90, 135, 72) = 1.
The GCF of 40 and 72 is 8.
The GCF is 6.
The GCF is 9.
The GCF is 8.
The GCF is 18.
The GCF is 10.
The GCF of 24, 40, and 72 is 8.
The GCF for 20 40 90 is 10.