SAT 完全没想明白.
In a volleyball league with 4 teams,each team plays exactly 2 games with each of the other 3 teams in the league.What is the total number of games played in this league?
人气：399 ℃ 时间：2020-05-01 14:25:46
解答
A,B,C,D 队,（3+2+1）*2=12 答案应该是12
A-B
A-C
A-D
B-C
B-D
C-D
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