Lemma
MediumPermutations & combinations
AQuA-RAT train #11522 · Combinatorics · Permutations & combinations

In how many ways can 5 letters be posted in 3 post…

In how many ways can 5 letters be posted in 3 post boxes, if any number of letters can be posted in all of the three post boxes?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #11522

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