Lemma
MediumPermutations & combinations
AQuA-RAT train #45269 · Combinatorics · Permutations & combinations

A bag contains 2 white balls, 3 black balls and 4 red…

A bag contains 2 white balls, 3 black balls and 4 red balls. In how many ways can 3 balls be drawn from the bag, if at least one black ball is to be included in the draw

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #45269

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