Evaluate the Formula for the Given Values of the Variables $\mathrm { n }$

Evaluate the formula for the given values of the variables.
-When all $\mathrm { n }$ teams in a league play every other team twice, a total of $\mathrm { N }$ games are played, where $\mathrm { N } = \mathrm { n } ^ { 2 } - \mathrm { n }$ . A basketball league has 5 teams and all teams play each other twice. How many games are played?

A) 15 games
B) 5 games
C) 20 games
D) 30 games