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bobeld
If the numbers are prime then the only factors are the numbers and 1.
For example - the factors of 5 are 1 and 5 and the factors of 7 are 1 and 7 so they only share the number 1.  That is the GCF of 5 and 7.
TSO
The greatest common factor of two numbers, one of which is 1, will always be 1.
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