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Old 11-03-2007, 07:58 PM
furyshade furyshade is offline
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Default Re: Russia National Contest Pr 1998-7

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unless im doing something wrong it seems the answer is 10 nPr 10, or 3628800

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You're counting a lot of numbers not in the solution. Remember, they need to be a multiple of 11111.

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then is it 10^5, if there are 10 combinations of x+y=9, and 5 sets of pairs
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