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Permutations and combinations. a.)A typesetter has before him 26 trays, one for each letter of the alphabet....

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Advance Math

Permutations and combinations.

a.)A typesetter has before him 26 trays, one for each letter ofthe alphabet. Each tray contains

10 copies of the same letter. In how many ways can he form athree letter word that

requires at most two different letter?

b.)Determine the number of ways of forming words which useexactly two different letters.

Answer & Explanation Solved by verified expert
4.0 Ratings (648 Votes)
a For at most two different letters we have the following two mutually exclusive cases Case 1 The first two letters are same The third letter can be arbitrarily chosen from the    See Answer
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