A high school has 2,000 students.
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This is given by the multinomial coefficient:
If you're not familiar with the multinomial coefficient, you may be able to see it more clearly if you count the number of possible combinations taking each distinct letter
times, where is the number of times it shows up in the original word.
If you're not familiar with the multinomial coefficient, you may be able to see it more clearly if you count the number of possible combinations taking each distinct letter