aloupis/comp61/notes/61-prob2-full.pdf · the 2 terms in the denominator are "mutually...
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Greg
The 2 terms in the denominator are "mutually exclusive", which means that they have no intersection. We can see that because one asks for A to happen, but the other asks for C to happen (among other things). In fact we should also include the term +P(we chose A AND door B was opened AND B)but this term is equal to zero. Here's what is going on. There is an event, X. In our case, X = (we chose A AND door B was opened). We are interested in P(X), as shown in orange above. We can say that P(X) = P(X and A) + P(X and B) + P(X and C), if A, B, C are mutually exclusive and cover all possibilities. Each of those 3 terms can have different values, but they will sum to P(X). Think of each term as a subset of X. (it makes sense that they are subsets of X, because they are more restrictive, and maintain all requirements of X). In fact not only are they subsets, but the 3 terms partition X. If X happens, then either (X and A) happens, or (X and B) happens, or (X and C) happens. In our case we have some additional information; X and B cannot happen.
Greg
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Greg
Greg
Greg
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