GRAPH THEORY:
Let G be a graph whose vertex set is a set V = {p_{1}, p_{2}, . . . , p_{6} } of six people. PROVE that there exist three people who are all friends with each other, or three people none of whom are friends with each other.
GRAPH THEORY: Let G be a graph whose vertex set is a set V = {p1, p2, . . . , p6 } of six people....