Lemma
MediumPermutations & combinations
AQuA-RAT train #87685 · Combinatorics · Permutations & combinations

How many such pairs of digits are there in the number 421579368…

How many such pairs of digits are there in the number 421579368 each of which has as many digits between them in the number as when they are arranged in ascending order?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #87685

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