Best Answer

GCF of a Prime number and a composite number is 1 if the prime number is not a factor of the composite number.

Here 103 is a prime number and 120 is a composite number. And 120 is not divisible by 103(or 103 is not a factor of 120).

So, GCF(103,120) = 1

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Q: What is the greatest common factor of 103 and 120?

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