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For the first letter, you can choose any of the four.

For the second letter, you can choose any of the remaining three.

For the third letter, you can choose either of the remaining two.

For the fourth letter, you don't get a choice, you have to use the one that's left.

So 4x3x2x1 = 24 possible permutations.

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Q: What are the number of permutations of the letters of the word MATH?
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