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30 December, 03:10

Number of different 5 digit combinations if successive digits msut be different

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  1. 30 December, 06:11
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    For the first digit you have 10 options (0 ... 9).

    For each next digit you can't choose the same digit, so you have 9 options.

    So number of combinations is 10*9*9*9*9 = 65610
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