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17-06-2018
Mathematics

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What's the number of 6-charcter passwords made of lowercase letters where no two consecutive characters are the same?

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sqdancefan sqdancefan

17-06-2018

The first letter can be any of 26. Each remaining letter can be any of the 25 that remain after the one before is deleted from consideration. Your number is
26·25^5 = 253,906,250

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