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0. There are (n + 1) white and (n + 1) black balls each set numbered 1 to n + 1. The number of ways in which the balls can be arranged in a row so that adjacent balls are of different colours, is
(2n + 2)!
(2n + 2)! X 2
(n + I)! x 2
2 {(n + 1)!}2
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