SOLUTION: IF P (A or B) = 0.8, and P (A) = 0.4, P (A and B) = 0.25, what is P(B)?

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Question 717210: IF P (A or B) = 0.8, and P (A) = 0.4, P (A and B) = 0.25, what is P(B)?

Answer by 20800563(2) About Me  (Show Source):
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From general rule of addition we have that P(A or B)=P(A)+P(B)-P(A and B) so we have 0.8=0.4+P(B)-0.25 so we get 0.8-0.15=P(B) and P(B)=0.65