AQuA-RAT train #74665 · Combinatorics · Permutations & combinations

Seven consecutive traffic signals each show either red or green

Seven consecutive traffic signals each show either red or green. How many different arrangements of the seven signals are possible?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #74665

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