Lemma
MediumCounting & chance
AQuA-RAT train #21743 · Probability · Counting & chance

There are 15 slate rocks, 20 pumice rocks, and 10 granite rocks…

There are 15 slate rocks, 20 pumice rocks, and 10 granite rocks randomly distributed in a certain field. If 2 rocks are to be chosen at random and without replacement, what is the probability that both rocks will be slate rocks?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #21743

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