document.write( "Question 871514: Parcels from sender S to receiver R pass sequentially through two post
\n" ); document.write( "offices. Each post office has a probability 1/5 of losing an incoming parcel, independently of all other parcels. Given that a parcel
\n" ); document.write( "is lost, the probability that it was lost by the second post
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Algebra.Com's Answer #525619 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi
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document.write( "P(A|B) = P(A and B)/P(B)
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document.write( "P(2nd|Lost) =  = 1/2 \n" );
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