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There are 9 points on the limited plane. Each point can form 8 couple of points with the 8 remaining points. If we consider the couple (A,B), we have 7 points left to form an (A,B,C) group. This group is a triangle only if C is not on the same line as A and B ==> means we have 6 points left (since t...
- by wydadi
Tue Nov 02, 2010 8:42 am- Forum: Problem Solving
- Topic: How many triangles on the coordinate plane
- Replies: 131
- Views: 79939
I don't get it yet. Let's see how I answered: in the word trust we have two similar letters T, which means every arrangement of the two T will count once since there is no difference between the Ts. That's why I consider only one T and then I'll put the other one. First, to rearrange the 4 letters T...
- by wydadi
Fri Aug 13, 2010 12:08 am- Forum: Problem Solving
- Topic: Arranging letters
- Replies: 6
- Views: 7076
Arranging letters
Hi all, I see this problem as an example in the Gmat Flashcards made by Eric of BTG. I don't understand why I have always an answer different of the one given. So before telling Eric there is a mistake, I want to be sure it is. Here is the question: How many ways can the letters in TRUST be arranged...
- by wydadi
Thu Aug 12, 2010 12:49 pm- Forum: Problem Solving
- Topic: Arranging letters
- Replies: 6
- Views: 7076
Hello Eric,
I'm new on the website. I just want to thank for all the efforts you do to help guys like me in our GMAT preparation.
I haven't visited yet all the sections here, but I'm sure I will find what I'm looking for.
As we say in my country Morocco : "choukrane ش�كْرًا "
- by wydadi
Wed Jul 14, 2010 1:59 pm- Forum: GMAT Strategy
- Topic: Download my free GMAT Flashcards!
- Replies: 406
- Views: 724071
It seems it's late to reply.- by wydadi
Wed Jul 14, 2010 1:40 pm- Forum: Lounge
- Topic: 5 *10 "Personal Tutor" hours giveaway - contest en
- Replies: 28
- Views: 6201