3x3 2x2x2
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330 165,2 55,3,2 11,5,3,2
The prime factors for 72 are: 2, 3
55 and 72 are relatively prime because they have no prime factors in common.
6 is not a prime number but it is a factor of 72
9x2x2x2 = 9 x 8 = 72 but it's not the prime factorization of 72 as 9=3x3 The prime factorization of 72 is 2x2x2x3x3 = 2^3 x 3^2