How to find P(B)? by solving with algebra?

IF P(AUB)= 0.8, P(A)=0.4, and P(A∩B)=0.15, find P(B). 

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1 Answer

P(A⋃B)=P(A)+P(B)-P(A⋂B),

0.8=0.4+P(B)-0.15,

P(B)=0.8+0.15-0.4=0.55.
by Top Rated User (1.2m points)

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