引用第995樓pongpong123於2010-04-16 23:56發表的“”:
咁其實個字係點解?
打左係947樓
Let A and B be two exhaustive events of a certain sample space.
Denote P(B) = b and P(A ︵B) = c, where 0<b<1 and 0<c<1
(a) Express P(A) in terms of b and c
(b) Suppose P(A l B) =1/2 and P(B l A) =2/3
(i) Find the values of b and c
(ii)Are the events A and B independent? Explain your answer.