Question

oblicz P (A^B)

a=1/7 b=2/4 P (A u B) = 10/12

Answer 1

w sensie, że "a' to P(A) ?

 

P(AUB) = P(A) + P(B)  - P(A^B)

10/12 = 1/7 + 2/4 - P(A^B)

P(A^B)=1/7 + 1/2 - 5/6

P(A^B) = 6/42 + 21/42 - 35/42 = - 8/42 = - 4/21