Lemma
MediumPermutations & combinations
AQuA-RAT train #54661 · Combinatorics · Permutations & combinations

A librarian has a set of eleven books, including four different books…

A librarian has a set of eleven books, including four different books about Abraham Lincoln. The librarian wants to put the eleven books on a shelf with the four Lincoln books next to each other, somewhere on the shelf among the other seven books. How many different arrangements of the eleven books are possible?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #54661

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