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Thread: Can't understand some probability symbols.

  1. #1
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    Can't understand some probability symbols.




    For two events, A and B, P(A) =1/2, P(B) =1/3, and P(A �� B) =1/4. Find P(B | A).

    The symbol where is shows a box here is an upsidedown U. Does anyone know what they're asking for here. I P(A upsidedown U B) the same as P(A and B). I'm not sure how to answer the question because I can't interpret the sybmols.

    Also, what does P(B|A) stand for? I is this P(B or A). Any help would be appreciated.

  2. #2
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    P(B|A) is the probability for B given A.

  3. #3
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    P(A upsidedown U B) is same as P(A and B), probability of A intersection B, the probability of happening of A and B together.

    P(A/B) is the probability of happening of A, given that B has already happend.
    P(A/B)=P(A and B)/P(B).

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