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Verified answer
Jawabn(s) = 20
n(r)= 5
banyak cara = 20 C5 = 20 !/ (20-5)! . 5!
= 20 !/ (15 !. 5!)
= 15.504
5 pemain utama dan 5 pemain cadangan
jika tanpa pemain cadangan 20 orang bisa di jadikan 4 tim