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Counting letter combinations

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Please explain thoroughly. Show or draw diagram.

1. How many four-letter words can be formed from the set of letters{m,o,n,e,y} ? Assume that any arrangement of letters is a word.How many four -letter words can be formed if the first letter must be y and the last letter must be m?( Assume no repetition).

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The solution provides an example of determining possible combinations of letters.

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Probability and sets
Please explain thoroughly. Thanks Show or draw diagram.

1. How many four-letter words can be formed from the set of letters {m, o, n, e, y}? Assume that any arrangement of letters is a word. How many four -letter words can be formed if the first letter must be y and the last letter must be m? (Assume no repetition.)

In the first case, we want all possible arrangement of 4 letters, when we select 4 of the 5 ...

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