跪求教两道DS

norlanzhang · 发表于 2011-2-24 23:03:27

1.S is a set of points inthe plane. How many ditinct triangles can be drawn that have three of the points in S as vertices?
(1) The number of distinct points in S is 5.
(2) No three of the points in S are collinear.

2. A total of 100 customers purchased books at a certain bookstore last week. If these customers purchased a total of 200 books, how many of the customers purchase only 1 book each?
(1) None of the customers purchased more than 3 books.
(2) 20 of the customers ourchased only 2 books each.

kazemi · 发表于 2011-2-24 23:08:23

http://www.beatthegmat.com/co-ordiates-t21406.html

kazemi · 发表于 2011-2-24 23:12:16

http://www.beatthegmat.com/books-purchased-t21407.html

跪求教两道DS

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