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Answers for “为什么我们要除以重数的阶乘?”

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To find the number of distinct arrangements of a word with repeated letters, you take the factorial of the total number of letters and divide it by the product of the factorials of the multiplicities of each repeated letter. This corrects for the overcounting caused by treating identical letters as distinct.

Conditions: The word contains repeated letters.; We are finding the number of distinct permutations (arrangements).