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The answer is always 1.
The GCF is always 1.
The LCM of two numbers is their product if and only if the two numbers are co prime, that is their HCF is 1. Otherwise their LCM in not their product, in fact, it is their product divided by their HCF.
As a product of its prime factors: 2*5*7 = 70 Note that at least two or more numbers are needed to find their HCF
In finding the LCM or HCF of two or more numbers