Question 224818: How many ways can three letters be chosen from the letters A,B,C,D, and E?
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! How many ways can three letters be chosen from the letters A,B,C,D, and E
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If repeats are allowed, eg AAA, it's 5*5*5 = 125
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If letters can't be reused, it's 5*4*3 = 60
The 1st letter is 1 of 5, then 1/4, then 1/3.
This is 5!/(5-3)! = 120/2 = 60
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If order doesn't matter, ie, if ABC is the same as ACB, then it's
5*4*3/(3*2*1) = 10
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