b.satu merah dan hijau
c.dua merah satu putih
d.1 bola putih
Penjelasan dengan langkah-langkah:
total bola = 10
diambil 3 bola secara acak
bola merah = 5
bola putih = 3
bola hijau = 2
a. (10)C(3) = 10! / 3! (10 - 3)!
= 10 x 9 x 8 x 7! / 3! (7!)
= 10 x 9 x 8 / 3 x 2
= 720 / 6
= 120 cara
b. (10)C(3) - (5)C(1) - (2)C(1)
= 120 - (5! / 1! (5 - 1)!) - (2! / 1! (2 - 1)!)
= 120 - (5 x 4! / 1 (4!)) - (2 x 1 / 1 (1))
= 120 - 5 - 2
= 113 cara
c. (10)C(3) - (5)C(2) - (3)C(1)
= 120 - (5! / 2! (5 - 2)!) - (3! / 1! (3 - 1)!)
= 120 - (5 x 4 x 3! / 2 (3!)) - (3 x 2! / 1 (2!))
= 120 - (20 / 2) - (3 / 1)
= 120 - 10 - 3
= 107 cara
d. (10)C(3) - (3)C(1)
= 120 - 3
= 117 cara
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