51 = 3 x 17
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20 = 22 x 51
The GCF of 6 and 51 is 3. The prime factorization of 6 is 2*3 The prime factorization of 51 is 3*17 So the GCF is 3.
45 = 32 x 51
The GCF of 51 and 65 is 1. The prime factorization of 51 is 3*17. The prime factorization of 65 is 5*13 They have no factors in common other than 1.
Factors of 51: 1, 3, 17, and 51 3 and 17 are prime.