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banyak cara memilih 3pria dari 7 pria = 7C3 = 7!/3!.4! = 5.6.7 / 6 = 35
banyak cara memilih 2 wanita dari 6 wanita = 6C2 = 6!/2!4! = 5.6 / 2 = 15
total cara tinggal dikalikan = 35x15 =525