There are n urns each containing (n+1) balls such that the i^th urn contains “i” white balls and (n+1−i) red balls. Let u_i be the event of selecting the i^th urn, i = 1, 2, 3 ..., n, and w denote the event of getting a white ball. If P (u_i) α i , where i = 1, 2, 3,.  .  ., n, the  is equal to

a) 1

b)

c)

d)