Using the 26 uppercase letters of the English alphabet: (a) How many 21-letter words contain the...
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Using the 26 uppercase letters of the English alphabet: (a) How many 21-letter words contain the subword "SOMETIME" twice? An example of such a word is ARSOMETIMEACSOMETIMEA. (b) How many 21-letter words do not contain the subword "SOMETIME" at all? (c) Explain how you obtained your answers to parts (a) and (b). Using the 26 uppercase letters of the English alphabet: (a) How many 21-letter words contain the subword "SOMETIME" twice? An example of such a word is ARSOMETIMEACSOMETIMEA. (b) How many 21-letter words do not contain the subword "SOMETIME" at all? (c) Explain how you obtained your answers to parts (a) and (b).
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