10 books are placed at random in a shelf

10 books are placed at random in a shelf. The probability that a pair of books will always be together is -

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

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #26419