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3 x 105
5 x 63
7 x 45
9 x 35
15 x 21
maka faktor prima = 3, 5, 7
315 : 3 = 105
105 : 3 = 35
35 : 5 = 7
7 : 7 = 1
faktor prima 315 adalah, 3,5,7