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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Since both 23 and 47 are prime numbers, their greatest common factor is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
47 is a prime number so the great common factor of 47 and any other number can only ever be 1.