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Paragraph: 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 u_i be the event of selecting ith urn, i=1,2,3, , n and W denotes the event of getting a white balls. Question: If P (u_i ) i , where i=1,2,3, , n , then _ n P(W) is equal to

Options

  1. A1
  2. B2 3
  3. C1 4
  4. D3 4

Correct answer

B. 2 3

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