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Let there are (n + 1) white and (n + 1) black balls. In each set, the balls are numbered from 1 to (n + 1). If these balls are to be arranged in a row so that consecutive balls are of different colours, then the number of these arrangements is |
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Answer» Let there are (n + 1) white and (n + 1) black balls. In each set, the balls are numbered from 1 to (n + 1). If these balls are to be arranged in a row so that consecutive balls are of different colours, then the number of these arrangements is |
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