SOLUTION: Given that P(A or B) = ½, P(A) = 1/3, and P(A and B) = 1/9, find P(B).

Question 1147922: Given that P(A or B) = ½, P(A) = 1/3, and P(A and B) = 1/9, find P(B).

Answer by ikleyn(52848) (Show Source): You can put this solution on YOUR website!
.


Use the general formula


    P(A or B) = P(A) + P(B) - P(A and B).


Substitute the given data into the formula to get an equation


     =  + P(B) - .


From the equation, find


    P(B) =  -  +  =  = .    ANSWER.

Solved.

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