for Expl: 3 bad 5 good : P(E)=( C(5,3)*C(3,0)+C(5,2)*C(3,1))/C(8,3)=40/56=.71....
for Expl: 3 bad 5 good : P(E)=( C(5,3)*C(3,0)+C(5,2)*C(3,1))/C(8,3)=40/56=.71....
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