15 = 3 x 5, 35 = 5 x 7
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Three and five are prime ,so the don't have prime factorization. Fifteen's prime factorization is 3 x 5.
No. 22 has prime factorization of 2*11, and 35 has prime factorization of 7*5. Since there are no common prime factors, 22/35 is irreducible (is in lowest terms).
35 = 243
35 x 11 = 2673