Three and five are prime ,so the don't have prime factorization.
Fifteen's prime factorization is 3 x 5.
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3 x 5 = 15
3 times 5 is what i got
15 = 3 x 5, 35 = 5 x 7
*)1 5)5 3)15 2)30 The prime factorization of 30 is 2 x 3 x 5.
3 x 5 = 15