Probability 3 Question 10

10. Let Ec denotes the complement of an event E. If E,F,G are pairwise independent events with P(G)>0 and P(EFG)=0. Then, P(EcFcG) equals(2007, 3M)

(a) P(Ec)+P(Fc)

(b) P(Ec)P(Fc)

(c) P(Ec)P(F)

(d) P(E)P(Fc)

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Solution:

  1. PEcFcG=P(EcFcG)P(G)

=P(G)P(EG)P(GF)P(G)=P(G)[1P(E)P(F)]P(G)[P(G)0]=1P(E)P(F)=P(Ec)P(F)



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