MathCastle
Graph TheoryChallengeDirected Graphs and Network Flows

Directed Graphs and Network Flows · Challenge problem

Teams 1,2,3,4,51,2,3,4,5 play a round robin (1010 games total). Among all 2102^{10} ways the games could be decided, in how many does the sorted list of the five teams' win totals come out to exactly 1,1,2,3,31,1,2,3,3?