Lemma
MediumPermutations & combinations
AQuA-RAT train #13332 · Combinatorics · Permutations & combinations

At a certain laboratory, chemical substance are identified by an unordered combination…

At a certain laboratory, chemical substance are identified by an unordered combination of three different colors. If no chemical may be assigned the same three colors as any other, what is the maximum number of substances that can be identified using nine colors?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #13332

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