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P(AvB) = P(A) + P(B) - P(A^B)
Żeby obliczyć P(A), korzystamy z P(A')
P(A) = 1 - P(A') = 1 - 0,5 = 0,5
0,9 = 0,5 + P(B) - 0,4
0,9 = 0,1 + P(B)
P(B) = 0,8