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= 10! / 7!
= 7! 8 x 9 x 10 / 7!
= 8 x 9 x 10
= 720 cara
Jadi, banyak cara memilih pengurus osis adalah 720 cara
Banyak yang dipilih = 3 (ketua, sekretaris dan bendahara)
10 P 3 = 10! / (10-3)!
= 10! / 7!
= 7! x 8 x 9 x 10 / 7!
= 8 x 9 x 10
= 720 cara