The factors of 47 are:
1, 47
The factors of 75 are:
1, 3, 5, 15, 25, 75
The common factor is:
1
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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.
As 47 is a prime number, the only possible factors are 1 and 47. 2728 is not divisible by 47, so the only common factor is 1.
Since both 23 and 47 are prime numbers, their greatest common factor is 1.
Applying Euclid's algorithm, the greatest common factor of 44 and 47 is the same as the greatest common factor of 44 and 3 - where 3 is the remainder of the division of 47 by 44.