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OpenStudy (anonymous):
How many seven-letter words contain at least one X?
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OpenStudy (lgbasallote):
combinatorics?
OpenStudy (anonymous):
7^26-7^25?
OpenStudy (anonymous):
yes indeed
OpenStudy (ash2326):
@tim93 check again, there is slight mistake
OpenStudy (ash2326):
your approach is correct, but there is a small mistake
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OpenStudy (anonymous):
i'm not seeing it
OpenStudy (anonymous):
26^7-
OpenStudy (anonymous):
25^7
OpenStudy (ash2326):
Yeah, you got it right now It's \[26^7-25^7\]
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