Lemma
MediumPermutations & combinations
AQuA-RAT train #61378 · Combinatorics · Permutations & combinations

Five consecutive traffic signals each show either red or green

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

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #61378

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