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There are (n+1) white and (n+1) black ...

There are `(n+1)` white and `(n+1)` black balls, each set numbered `1ton+1.` The number of ways in which the balls can be arranged in a row so that the adjacent balls are of different colors is a. `(2n+2)!` b. `(2n+2)!xx2` c. `(n+1)!xx2` d. `2{(n+1)!}^2`

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