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There are n urns each containing (n+1) balls such that ith urn contains i white balls and (n+1-i) red balls. Let u_i be the event of selecting ith urn, i=1,2,3…, n and w denotes the event of getting a white ball. IfP(u_i)=c, where c is a constant then P(u_n/w) is equal to

A

`2/3`

B

`1/3`

C

`3/4`

D

`1/4`

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