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Count the number of strings of length 8 over a = {w, x, y, z} that begins with either w or y and have at least one x.

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konrad509

[tex]1\cdot4^3\cdot2=128[/tex] - all starting with w or y

[tex]1\cdot3^3\cdot2=54[/tex] - all starting with w or y, not having any x

[tex]128-54=74[/tex] - starting with w or y and having at least one x

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