Lemma
MediumCounting & chance
AQuA-RAT train #51234 · Probability · Counting & chance

In a room with 10 people, 7 people have exactly 1 friend…

In a room with 10 people, 7 people have exactly 1 friend in the room and 6 people have exactly 2 friends in the room (Assuming that friendship is a mutual relationship, i.e. if Jane is Paul's friend, Paul is Jane's friend). If two individuals are selected from the room at random, what is the probability that those two individuals are NOT friends?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #51234

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