SOLUTION: How many three letter combinations can be made fro the letters in the word MATH?

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Question 343177: How many three letter combinations can be made fro the letters in the word MATH?
Answer by nyc_function(2741) About Me  (Show Source):
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We use nCr = n!/r!(n - r)!
Let n = 4
Let r = 3
4C3 = 4!/3!(4 - 3)!
4C3 = 24/6(1!)
4C3 = 24/6(1)
4C3 = 24/6
4C3 = 4