Because 7 is the largest positive integer that divides evenly into all of those numbers with no remainder.
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1 and 7
The greatest common factor of 49 and 84 is 7
Common factors of 49 and 14 are: 1 and 7.
The GCF of 15 and 49 is 1. The factors of 15 are 1, 3, 5, and 15 The factors of 49 are 1, 7, and 49 The only common factor is 1, so the greatest common factor of 15 and 49 is 1.
The Greatest Common Factor (GCF) is: 1