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There are n students in a class. Ler P(E...

There are n students in a class. Ler `P(E_lambda)` be the probability that exactly `lambda` out of n pass the examination. If `P(E_lambda)` is directly proportional to `lambda^2(0lelambdalen)`.
If a selected student has been found to pass the examination, then the probability that he is the only student to have passed the examination, is

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