11 persons are sitting ina row

11 persons are sitting ina row. how many ways can 11persons be arranged in a row such that 3 persons should always be together?

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 #50792