A factor of a number will divide that number evenly. A common factor is any factor which two numbers share. One of the numbers here is 1. The only number that can divide evenly in to is 1. Therefore, it doesn't matter what the other number is, the HCF can only be 1.
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The GCF is 1.
The HCF is: 2
The GCF is 1.
The HCF is: 2
Yes: product of a & b = LCM x HCF so b = (LCM x HCF)/a