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In a set of numbers if one of the numbers is 1 then GCF is 1.
Reason:
GCF of a set of numbers can never be greater than the smallest number of the set. So in this case GCF can't be greater than 1.
Since 1 is a factor of every number then it is the factor shared by every number.
So 1 is always in the list of common factors.
But here one of the numbers is 1 then GCF is 1 because 1 is the only common factor.
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