Computers and Technology, 03.12.2020 19:50 kayleerichards666

How many permutations for a 7 characters in length string, which contains all following letters R, X, S, Y, T, Z, U, has either the string 'RXS' or string 'ZU' in the 7 characters string?

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How many permutations for a 7 characters in length string, which contains all following letters R, X...

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