The "wrong envelope problem" was proposed by Daniel Bernoulli (Daniel Bernoulli, 1700-1782), the son of the most famous mathematician at that time, Johann Bernoulli (1667-1748), to the effect that a
person He wrote n different letters and corresponding n different envelopes. He put the n letters in the wrong envelopes. How many ways are there to put them in the wrong envelopes?
formula:
full dislocation formula
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Origin blog.csdn.net/qq_38664402/article/details/129226947
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