Lemma
MediumPermutations & combinations
AQuA-RAT train #6459 · Combinatorics · Permutations & combinations

In how many ways can 21 books on English and 19 books…

In how many ways can 21 books on English and 19 books on Hindi be placed in a row on a shelf so that two books on Hindi may not be together?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #6459

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