GCF +=====+ The greatest common factor of a set of numbers is | Programming Challenges - How to be a breathtaking Programmer

GCF
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The greatest common factor of a set of numbers is the largest number that all numbers can be divided by without a reminder, for example, the greatest common factor of 21, 49, and 35 is 7 because they all can be divided by 7 without a reminder.
Challenge:
Write a function that takes any number of arguments and returns the greatest common factor.
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Thank you to @ayoob2 for submitting this question -
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