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n(S) = 9C3 = 84
misal A kejadian terambil sekurang kurangnya 2 bola putih (2P1H atau 3P0H)
n(A) = 5C2 x 4C1 + 5C3 x 4C0
n(A) = 10x4 + 10x1
n(A) = 50
P(A) = 50/84
Fh(A) = n x P(A) = 84 x 50/84 = 50 kali