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Best Answer
The greatest common factor of 45 and 75 is 15, because it is the highest number that will divide into 45 and 75 evenly.
The prime factorization of 45 is 3*3*5
The prime factorization of 75 is 3*5*5
The common prime factors are 3*5 = 15, so that is the GCF.
The GCF is 15.
It is: 15
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