AQuA-RAT train #37533 · Combinatorics · Permutations & combinations

Twenty-one dots are evenly spaced on the circumference of a circle

Twenty-one dots are evenly spaced on the circumference of a circle. How many combinations of three dots can we make from these 21 dots that do not form an equilateral triangle?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #37533

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