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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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