Lemma
MediumPermutations & combinations
AQuA-RAT train #9913 · Combinatorics · Permutations & combinations

A box contains 5 red, 4 blue, and 3 white balls

A box contains 5 red, 4 blue, and 3 white balls. In how many ways can we select 4 balls such that at least 2 are red?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #9913

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