Lemma
MediumPermutations & combinations
AQuA-RAT train #4909 · Combinatorics · Permutations & combinations

An art gallery owner is hanging paintings for a new show

An art gallery owner is hanging paintings for a new show. Of the nine paintings she has to choose from, she can only hang three on the main wall of the gallery. Assuming that she hangs as many as possible on that wall, in how many ways can she arrange the paintings?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #4909

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