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The GCF is 4.
GCF(16, 28, 56) = 4
The GCF of 16, 28 and 56 is 4.
The GCF is 28.
The GCF of 56, 196, and 28 is 28.
GCF(28, 56, 84) = 28
The GCF is 7.
The GCF is 14.