Question

Jesli P(A)/P(A') = 2 to prawdopodobieństwo zdarzenia A' wynosi

Answer 1

Korzystamy z:
P(A) + P(A') = 1
P(A') = 1 - P(A)

mamy
P(A) / (1 - P(A) = 2 /* 1-P(A)
P(A) = 2* ( 1 - P(A))
P(A) = 2 - 2P(A)
3P(A) = 2 /: 3
P(A) = 2/3
P(A') = 1 - 2/3
P(A') = 1/3