Lemma
MediumPermutations & combinations
AQuA-RAT train #51449 · Combinatorics · Permutations & combinations

Which of the following is the ninth to the right of the…

Which of the following is the ninth to the right of the twentieth element from the right end of the above arrangement?

Its source gives only the correct option, without the working.

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #51449

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