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Anonymous
GCF (21, 84, 91) = 7
Factors of 21: 1, 3, 7, 21
Factors of 84: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84
Factors of 91: 1, 7, 13, 91
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The GCF is 7.