Lemma
MediumPermutations & combinations
AQuA-RAT train #84083 · Combinatorics · Permutations & combinations

There are 4 different letters and 4 addressed envelopes.In how many ways…

There are 4 different letters and 4 addressed envelopes.In how many ways can the letters be put in the envelopes so that atleast one letter goes to the correct address ?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #84083

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