Lemma
MediumCounting & chance
AQuA-RAT train #64464 · Probability · Counting & chance

A card shop contains 10 birthday cards, 10 holiday cards, and 9…

A card shop contains 10 birthday cards, 10 holiday cards, and 9 graduation cards. If three cards are purchased at random from the shop, what is the probability that the three cards will be of the same type?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #64464

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