Another approach (other than 16C2) is this:There are 16 teams in a soccer league, and each team plays each of the others once. Given that each game is played by two teams, how many total games will be played?
A) 256
B) 230
C) 196
D) 169
E) 120
If we ask each team, "How many teams did you play?" we'll find that each team played 15 teams, which gives us a total of 240 games (since 16 x 15 = 240).
From here we need to recognize that each game has been counted twice. For example, if Team A and Team B play a game, then Team A counts it as a game and Team B counts it as a game.
So, to account for the duplication, we'll divide 240 by 2 to get [spoiler]120 (E)[/spoiler]
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Cheers,
Brent