There $100$ people seated at a round table $50$ women and $50$ men.
Source: Serbia JBMO TST 2014
October 6, 2023
combinatorics
Problem Statement
There people seated at a round table women and men. Show that there are two people of opposite gender that stay between two people of opposite gender. (WWMM, MMWW, WMWM, MWMW)