作者matilde207 (理想浮华)
看板GMAT
标题[计量] GWD12 Q2
时间Sun Jul 6 22:52:19 2008
GWD12 Q2.
If each of the 12 teams participating in a certain tournament
plays exactly one game with each other teams, how many games will be played?
Ans: 66
可以请会的人告诉66是怎麽计算出来的吗
谢谢!
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※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 118.166.54.32
1F：推 KOBEII:C12取2 12X11/2! ? 07/06 22:57
2F：→ matilde207:看懂了 非常感谢! 07/06 23:12
3F：推 cu343:也可以用11+10+9+....+1 07/07 00:05