Lemma
MediumPermutations & combinations
AQuA-RAT train #47664 · Combinatorics · Permutations & combinations

In how many ways can 10 books be arranged on a shelf…

In how many ways can 10 books be arranged on a shelf such that a particular pair of books should always be together?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #47664

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