AQuA-RAT train #3669 · Combinatorics · Permutations & combinations

A store sells nine different kinds of shirts

A store sells nine different kinds of shirts. If we want to buy two different kinds of shirts, how many possible combinations of two shirts can we buy?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #3669

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