Obliczanie prawdopodobieństwa

[mionka2]

Niech \(\displaystyle{ P(A')=\frac{9}{20}, P(B)= \frac{4}{5}}\) i \(\displaystyle{ P(A \cap B)= \frac{1}{2}}\) , oblicz \(\displaystyle{ P(A \cup B')}\)

[Qń]

\(\displaystyle{ P(A \cup B')=P(A)+P(B')-P(A\cap B') = P(A)+P(B') + P(A \setminus B) = \\ =P(A)+P(B')+P(A \setminus (A \cap B)) = P(A)+P(B')+P(A) - P(A \cap B) = \ldots}\)

Q.