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n(S) = 15 bola
a. Berwarna merah
P(A) = n(A) = 6 = 2
n(S) 15 5
b.Berwarna bukan merah
P(A) = n(A) = 9 = 3
n(S) 15 5
c.Berwarna putih
P(A) = n(A) = 4
n(S) 15
d.Berwarna merah dan putih
P(A) = n(A) = 10 = 2
n(S) 15 3