SOLUTION: If P(A) = 0.44, P(A and B) = 0.3, and P(A or B)=0.98, find P(B)

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Question 1098719: If P(A) = 0.44, P(A and B) = 0.3, and P(A or B)=0.98, find P(B)
Answer by ikleyn(52898) About Me  (Show Source):
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There is this basic identity for probabilities:


P(A or B) = P(A) + P(B) - P(A and B).    //It is a basic, and you must MEMORIZE and UNDERSTAND it.


From it,

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