Well, darling, the Greatest Common Factor (GCF) of 15, 36, and 42 is 3. As for the Lowest Common Factor (LCF), I hate to break it to you, but that term doesn't exist in mathematics. Maybe you meant the Least Common Multiple (LCM), which would be 252 for these numbers. Hope that clears things up for you, sugar!
gcf(15, 42) = 3.
The GCF is 6.
The GCF is: 6
GCF(36, 42, 72) = 6
The GCF of 36, 42, and 54 is 6.
Their GCF is 6
The GCF is 6.
The GCF is 6.
The greatest common factor of 42 and 36 is 6.6 x 7 = 426 x 6 = 36
It is: 6
The least common factor of any set of integers is 1.
1 for factor and 42 is the least common multiple. The LCF is 1. The GCF is 1. The LCM is 42.