P(B)=0.5, P(A or B)=0.3, and P(A and B)=0.6, find P(A) How would you do this? The answer is {P(A)= 0.4} but how in the world do you get that? How do you do it? Thanks!
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Hello ! Do you know this formula ... ? Just draw a diagram
What kind of diagram? Like a Venn Diagram? Where would I put all the information though? I don't get it
Originally Posted by hellotarina P(B)=0.5, P(A or B)=0.3, and P(A and B)=0.6, find P(A) The problem contains inconsistent data. For all events this is true: . But look at the given: So is impossible.
For some reason my professor tells me the answer is P(A) = 0.4 and it is for a test which I have tomorrow and I didn't have a chance to ask about it. I have made sure I've typed it correctly to no avail.
Originally Posted by hellotarina For some reason my professor tells me the answer is P(A) = 0.4 and it is for a test which I have tomorrow and I didn't have a chance to ask about it. Perhaps you copied it down incorrectly. If it were is correct.
Well thank you guys anyway.
Originally Posted by Plato Perhaps you copied it down incorrectly. If it were is correct. I suspect the question has been copied correctly but the professor who set the question has not thought past the following equation: . @OP: Ask your professor how comfortable s/he is that it follows from the given data that .
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