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kita gunakan kombinasi,karna ini diambil secara acak dan bebas :
C(20,15) = 20!/(20-15)! 15 ! = 20! / 5! . 15! = 20.19.18.17.16.15! / 15!.5!
= 20.19.18.17.16 / 5.4.3.2.1 = 1.860.480/120 = 15.504 cara