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IIT JEE Advanced 2006 Paper 1

Paragraph for Questions 107–109:
There are n urns each containing (n + 1) balls such that the ith urn contains i white balls and (n + 1 – i) red balls. Let ui be the event of selecting ith urn, i = 1, 2, 3, …, n and W denotes the event of getting a white ball.

Question : 109

Total: 120

If n is even and E denotes the event of choosing even numbered urn (P(ui)=

) , then the value of P(W/E) is

n+2
2n+1
n+2
2(n+1)
n
n+1
1
n+1

Validate

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