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GCD: 13
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Factors of 91: 1, 7, 13, 91Factors of 117: 1, 3, 9, 13, 39, 117GCF (91, 117) = 13
For 117, 91, 65, 21 the LCM is: 4,095
The GCF is 13.
117/91(divide both sides by 13)9/7
The LCM is: 1,638