Posted by Erica on .
Assume that P(A) = 0.4, P(B) = 0.4, and P(A∪B) = 0.7. Find P(A∩B) and P(A complement ∩ B complement).

Probability 
Cecile,
Recall:
P(AâˆªB) = P(A) + P(B)  P(Aâˆ©B)
do we already given 3 of the unknown for this expression to find P(Aâˆ©B) ?