Posted by Katie on Monday, October 3, 2011 at 8:43pm.
In how many ways can the letters of the word EIGHT be arranged using only four of the letters at a time?

math  Damon, Monday, October 3, 2011 at 8:55pm
combinations of 5 letters taken four at a time
= 5!/[4! (54)!] = 5

math  Reiny, Monday, October 3, 2011 at 9:07pm
The letters are to be arranged, so order matters.
number of ways = 5x4x3x2 = 120
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