A lot of 100 items contains 10% which are defective and 90% nondefective. Two are chosen...

A lot of 100 items contains 10% which are defective and 90% nondefective. Two are chosen at random. Let A = {the first item non defective}, B = {the second item non defective}. Find P(B) and show P(B) = P(A). Why is this?

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