John tossed a fair coin 6 times

John tossed a fair coin 6 times. What is the probability that the coin landed heads up exactly twice?

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 #24421

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