Lemma
MediumPermutations & combinations
AQuA-RAT test #214 · Combinatorics · Permutations & combinations

How many ways A boy can reach the top of stairs which…

How many ways A boy can reach the top of stairs which contain 10 steps, when he can take either one or two steps every time?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · test #214

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