Solve the Problem $n$ Teams in Which Each Team Plays Every Other Team Twice

Multiple Choice

Solve the problem.
-In a sports league of $n$ teams in which each team plays every other team twice, the total number $N$ of games to be played is given by $\mathrm{N}=\mathrm{n}^{2}-\mathrm{n}$ . What is the total number of games to be played in a football league having 17 teams?

A) 289
B) 272
C) 34
D) 306