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## OG 18, question-187

tagged by: Brent@GMATPrepNow

# This topic has 4 expert replies and 0 member replies

### Top Member

vaibhav101 Master | Next Rank: 500 Posts
Joined
01 May 2017
Posted:
100 messages
4

#### OG 18, question-187

Sun Oct 15, 2017 4:22 am
There are 8 teams in a certain league and each team plays each of the other teams exactly once. If each game is played by 2 teams, what is the total number of games played?

A. 15
B. 16
C. 28
D. 56
E. 64

### GMAT/MBA Expert

Brent@GMATPrepNow GMAT Instructor
Joined
08 Dec 2008
Posted:
11838 messages
Followed by:
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GMAT Score:
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Sun Oct 15, 2017 5:48 am
vaibhav101 wrote:
There are 8 teams in a certain league and each team plays each of the other teams exactly once. If each game is played by 2 teams, what is the total number of games played?

A. 15
B. 16
C. 28
D. 56
E. 64
There are 8 teams. If we ask each team, "How many teams did you play?" we'll find that each team played 7 teams, which gives us a total of 56 games (since 8 x 7 = 56).

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 ALSO counts it as a game.

So, to account for the DUPLICATION, we'll divide 56 by 2 to get 28 (C)
--------------------------
Here are three related questions:
https://www.beatthegmat.com/ugghhh-i-pick-this-question-from-btg-forum-t267675.html
https://www.beatthegmat.com/number-of-handshakes-t100109.html
https://www.beatthegmat.com/soccer-time-t70860.html

Cheers,
Brent

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### GMAT/MBA Expert

Brent@GMATPrepNow GMAT Instructor
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Sun Oct 15, 2017 5:52 am
vaibhav101 wrote:
There are 8 teams in a certain league and each team plays each of the other teams exactly once. If each game is played by 2 teams, what is the total number of games played?

A. 15
B. 16
C. 28
D. 56
E. 64
We can also use counting techniques to answer this question.

The question is asking us to determine the number of different ways to select 2 teams to play a game.
Since the order in which we select 2 teams does not matter, we can use COMBINATIONS

We can select 2 teams from 8 teams in 8C2 ways
8C2 = 28

If anyone is interested, we have a free video on calculating combinations (like 8C2) in your head: http://www.gmatprepnow.com/module/gmat-counting/video/789

Cheers,
Brent

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### GMAT/MBA Expert

Scott@TargetTestPrep GMAT Instructor
Joined
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Mon Dec 18, 2017 7:38 am
vaibhav101 wrote:
There are 8 teams in a certain league and each team plays each of the other teams exactly once. If each game is played by 2 teams, what is the total number of games played?

A. 15
B. 16
C. 28
D. 56
E. 64
We are given that there are 8 teams in a league and that each game is played by 2 teams. Note that each team does not play itself and the order of pairing each team with its opponent doesn't matter. [For example, the pairing of (Team A vs. Team B) is identical to the pairing of (Team B vs. Team A).] The situation can therefore be solved by finding the number of combinations of 8 items taken 2 at a time, or 8C2:

8C2 = 8!/2!(8-2)!] = (8 x 7)/(2 x 1) = 56/2 = 28

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### GMAT/MBA Expert

Brent@GMATPrepNow GMAT Instructor
Joined
08 Dec 2008
Posted:
11838 messages
Followed by:
1232 members
5254
GMAT Score:
770
Mon Dec 18, 2017 7:46 am
vaibhav101 wrote:
There are 8 teams in a certain league and each team plays each of the other teams exactly once. If each game is played by 2 teams, what is the total number of games played?

A. 15
B. 16
C. 28
D. 56
E. 64
There are 8 teams. If we ask each team, "How many teams did you play?" we'll find that each team played 7 teams, which gives us a total of 56 games (since 8 x 7 = 56).

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 ALSO counts it as a game.

So, to account for the DUPLICATION, we'll divide 56 by 2 to get 28

Cheers,
Brent

_________________
Brent Hanneson – Creator of GMATPrepNow.com
Use our video course along with

Check out the online reviews of our course
Come see all of our free resources

GMAT Prep Now's comprehensive video course can be used in conjunction with Beat The GMAT’s FREE 60-Day Study Guide and reach your target score in 2 months!

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