Y by Adventure10, Mango247
Suppose there are
Martians and
Earthlings at an intergalactic peace conference. To ensure the Martians stay peaceful at the conference, we must make sure that no two Martians sit together, such that between any two Martians there is always at least one Earthling.
(a) Suppose all
Martians and Earthlings are seated in a line. How many ways can the Earthlings and Martians be seated in a line?
(b) Suppose now that the
Martians and Earthlings are seated around a circular round-table. How many ways can the Earthlings and Martians be seated around the round-table?


(a) Suppose all

(b) Suppose now that the

This post has been edited 1 time. Last edited by Amir Hossein, Jan 15, 2025, 2:49 AM