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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 P(A) be the probability that a student selected at random has passed the examination, then P(A), is

A

`(1)/(sumn)`

B

`(1)/(sumn^2)`

C

`(1)/(sumn^3)`

D

`(1)/(sumn^4)`

Text Solution

Verified by Experts

The correct Answer is:
(b)
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