SOLUTION: if P(A and B)=0.2, compute P(A orB)

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Question 854138: if P(A and B)=0.2, compute P(A orB)
Answer by harpazo(655) About Me  (Show Source):
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P(A or B) = P(A) + P(B) - P(A and B)
We are given that P(A and B) = 0.2.
P(A or B) = P(A) + P(B) - 0.2
We need to know P(A) and P(B) to find the P(A or B).
There is missing information here.