Mathematics, 20.07.2019 03:30 xxkeyxx51
Using the letters a, b, c, d, e, f find the number of 4-letter "words" such that: a) a letter can be repeated; b) letters cannot be repeated, but can be in any order; c) letters cannot be repeated, and must be used in alphabetical order; d) which of the above counting question is a combination and which is a permutation? a "word" is any mixture of the letters.
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Using the letters a, b, c, d, e, f find the number of 4-letter "words" such that: a) a letter can b...
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