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Mathematics, 28.07.2019 22:00 brusawerin5969
Television and radio stations use four call letters starting with w or k, such as wxyz or krld. assuming no repetitions in the second to fourth letters, how many four-letter sets are possible using either w or k and only the letters upper f to upper x? (count all possibilities even though, practically, some may be inappropriate.)
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Television and radio stations use four call letters starting with w or k, such as wxyz or krld. assu...
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