0 votes 0 votes Show that in a group of five people (where any two people are either friends or enemies), there are not necessarily three mutual friends or three mutual enemies. Combinatory combinatory counting pigeonhole-principle + – Anu asked Jul 14, 2015 • retagged Jun 27, 2017 by Arjun Anu 907 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
Best answer 1 votes 1 votes https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CB4QFjAAahUKEwiGsbLmwODGAhXDW44KHYbdD5A&url=http%3A%2F%2Fpeople.math.sc.edu%2Fkustin%2Fteaching%2F574%2Fq574-3-2-06.pdf&ei=NBaoVYbHBsO3uQSGu7-ACQ&usg=AFQjCNGVQAfyFu-7NoEMpP0RK9QhCv2Sfg&sig2=PggJgcHYJoK3003ypov3Pg Rohan Ghosh answered Jul 16, 2015 • selected Dec 1, 2015 by Akash Kanase Rohan Ghosh comment Share Follow See all 0 reply Please log in or register to add a comment.