1.

There are n black balls and 2 red balls in a bag. One by one balls are drawn from the bag X wins as soon as 2 black balls are drawn and Y wins as soon as 2 red balls are drawn. The game continuous until one of 2 wins. Let X(n) and Y(n) denotes the probability that X and Y wins respectively. Then the value of Y(n) is '

Answer»

`(1)/((N+1)(n+2))`
`(6)/((n+1)(n+2))`
`(6)/(n(n+1(n+2))`
`(1)/(n(n+1)(n+2))`.

ANSWER :B


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