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There are 10 white and 10 black balls marked 1,2,3,...,10. The number of ways in which we can arrange these balls in a row in such a way that neighbouring balls are of different colour, is |
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Answer» There are 10 white and 10 black balls marked 1,2,3,...,10. The number of ways in which we can arrange these balls in a row in such a way that neighbouring balls are of different colour, is |
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