Algebra2
posted by Christina .
IF P(A)=40%,P(A OR B)=60%,P(A AND B)=30% WHAT IS P(B)

P(A or B) = P(A) + P(B)  P(A and B)
everything except P(B) is given
sub in the values, make sure to change the percents to decimals
e.g. 60% = .6
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