The string "YONYOU", there are several different ways to arrange it all

Others 2021-03-21 22:33:33 views: null

If the six letters are different, there are A66 methods,
but there are two repeated letters, one repeated letter is divided by 2, two is A66 /4=180

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Origin blog.csdn.net/qq_43360777/article/details/105875691

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