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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
75% (01:25) correct
25%
(02:05)
wrong
based on 382
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There are, in a certain league, 20 teams, and each team face another team for a total of 10 times. How many games are played in the season?
A. 1900
B. 3600
C. 2400
D. 180
E. 5400
Kudos for the first who answers with the right answer
A. 1900
B. 3600
C. 2400
D. 180
E. 5400
Kudos for the first who answers with the right answer
25 Feb 2011, 12:50
Kudos
Bookmarks
Derek1988
There are, in a certain league, 20 teams, and each team face another team for a total of 10 times. How many games are played in the season?
a) 1800
b) 3600
c) 2400
d) 180
e) 5400
Kudos for the first who answers with the right answer
a) 1800
b) 3600
c) 2400
d) 180
e) 5400
Kudos for the first who answers with the right answer
OA SHOULD be A but I don't get how
Choose 2 teams out of 20 teams = 20C2 = 190 (sets that can be formed)
Each set of team plays 10 games = 190 * 10 = 1900.
General Discussion
06 Jan 2011, 10:05
Kudos
Bookmarks
unfortunately, i went the long way. it took about 2:20 to do.
since there are 20 teams, and each team plays the other team a total of 10 times, then the 1st team will play a total of 190 games (there are 19 other teams played 10 times each so 19*10 = 190), our second team will play a total of 180 games, our 3rd team will play 170.......
adding all of these up, we get 1800.
hopefully someone can post an answer that is shorter. i'm not the best with combination-type problems.
Master Bunuel might be able to provide a good explanation.
since there are 20 teams, and each team plays the other team a total of 10 times, then the 1st team will play a total of 190 games (there are 19 other teams played 10 times each so 19*10 = 190), our second team will play a total of 180 games, our 3rd team will play 170.......
adding all of these up, we get 1800.
hopefully someone can post an answer that is shorter. i'm not the best with combination-type problems.
Master Bunuel might be able to provide a good explanation.
OMG. 
