Question 1203260
<pre>
Maybe the student could see it better if we explained it in terms of "AND usually
means MULITIPLY" and "OR usually means ADD".  The desired probability is:


                                    P("C bussed" AND "C broke dish")
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P[("A bussed" AND "A broke dish") OR ("B bussed" AND "B broke dish") OR ("C bussed" AND "C broke dish")]

which means that we perform these operations:

                                    P("C bussed") x P(C broke dish")
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P("A bussed") x P("A broke dish") + P("B bussed") x P("B broke dish") + P("C bussed") x P("C broke dish")

                                              0.3 x 0.04
                                  ------------------------------------
                                  0.6 x 0.06 + 0.1 x 0.02 + 0.3 x 0.04 

which comes out to be 0.24.

Edwin</pre>