Lemma
MediumPermutations & combinations
AQuA-RAT train #44837 · Combinatorics · Permutations & combinations

How many ways are there to lay four balls, colored red, black…

How many ways are there to lay four balls, colored red, black, blue and green in a row?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #44837

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