中学数学问题，请帮忙 donz940862007-02-19 06:31:19

1. A committee of 3 teachers are to select the winner from among ten students nominated for special award. The teachers each make a list of their top three choices in order, the lists have only one name in common, and that name has a different rank on each list. in how many ways could the teachers have made their list?
2. In how many ways could a class of 18 students divide into groups of 3 students?
Urgent

Thanks in advance

回复：中学数学问题，请帮忙

到脑筋急转坛也去发个帖吧，他们那边的数学家们都闲得发慌了。

P(3) × C(10, 3); C(18, 3)

thanks

P（3）*C（3，10）*C（1，3）*C（2，7）*C（2，5）

haha, misread one info. The revised answer -->

2) C(18, 3) × C(15, 3) × C(12, 3) × C(9, 3) × C(6, 3) × C(3