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2015
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5. 403
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13. 31
2015 = 5. 13. 31
mis: Faktor dari 2015 = M
Faktor dari 2015
*1
*5
*13
*31
*5 x 13 = 65
*5 x 31 = 155
*13 x 31 = 403
*5 x 13 x 31 = 2015
M = {1, 5, 13, 31, 65, 155, 403, 2015}
n(M) = 8
Jadi, banyak faktor dari 2015 adalah 8