Wiedząc, że p (a) równa się 3/8 p(b')1/2 p(aub)równe trzy czwarte. Wyznacz p(a [u w dół] b)
P(A) = 3/8
P|(B') = 1/2, WIĘC P(B) = 1-1/2 = 1/2
P(AuB) = 3/4
P(AnB) = ?
P(AuB) = P(A) + P(B) - P(AnB)
3/4 = 3/8 + 1/2 - P(AnB)
P(AnB) = 3/8+1/2-3/4 = 3/8 + 4/8 - 6/8 = 7/8 - 6/8 = 1/8
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P(A) = 3/8
P|(B') = 1/2, WIĘC P(B) = 1-1/2 = 1/2
P(AuB) = 3/4
P(AnB) = ?
P(AuB) = P(A) + P(B) - P(AnB)
3/4 = 3/8 + 1/2 - P(AnB)
P(AnB) = 3/8+1/2-3/4 = 3/8 + 4/8 - 6/8 = 7/8 - 6/8 = 1/8