math

In how many ways can the letters of the word EIGHT be arranged using only four of the letters at a time?

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  1. combinations of 5 letters taken four at a time

    = 5!/[4! (5-4)!] = 5

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  2. The letters are to be arranged, so order matters.

    number of ways = 5x4x3x2 = 120

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  3. 120

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