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Cukup dengan 10 merah diambil 2 dikali 6 hitam diambil 2.
₁₀C₂ = 10! / 2! 8! = 10.9.8! / 2.8! = 10.9/2 = 45
₆C₂ = 6! / 2! 4! = 6.5.4! / 2.4! = 6.5 / 2 = 15
Kalikan, didapat 675
Jika peluangnya:
n(A) = 675 [Diberikan di atas]
n(S) = ₁₆C₄ = 16! / 4!.12! = 16.15.14.13/4.3.2 = 1820
Maka,
P = 675/1820 = 135/364