1.

There are (n+1) white and (n+1) black balls, each set numbered from 1 to n+1. The number of ways in which the balls can be arranged in a row so that the adjacent balls are of different colours is

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There are (n+1) white and (n+1) black balls, each set numbered from 1 to n+1. The number of ways in which the balls can be arranged in a row so that the adjacent balls are of different colours is



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