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A: terambil As
B: terambil merah
A∩B: terambil As berwarna merah
n(A) = 4
n(B) = 13
n(A∩B) = 2
P(A) = n(A)/n(S) = 4/52
P(B) = n(B)/n(S) = 13/52
P(A∩B) = n(A∩B)/n(S) = 2/52
P(A∪B) = P(A) + P(B) - P(A∩B) = 4/52 + 13/52 - 2/52 = 15/52
jadi peluang terambil nya kartu as atau kartu merah adalah 15/52