SOLUTION: If P(A) = 0.80, P(B) = 0.70 AND P(A or B) = 0.90, then P(A and B) is what?

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Question 395057: If P(A) = 0.80, P(B) = 0.70 AND P(A or B) = 0.90, then P(A and B) is what?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
P(A and B) = P(A) + P(B) - P(A or B) = 0.80 + 0.70 -0.90 =0.6