Search found 4 matches
- by hiojay
Sat May 02, 2009 9:05 pm- Forum: Problem Solving
- Topic: '3' exactly twice
- Replies: 22
- Views: 4529
4C2 means that out of 4 possible positions, we want to find out how many ways we can select groups of 2 (order doesn't matter). In the context of this question, we basically want to find out how many ways we can select groups of 2 digits (order doesn't matter) from a single group of 4 digits. The fo...
- by hiojay
Wed Apr 29, 2009 9:05 pm- Forum: Problem Solving
- Topic: '3' exactly twice
- Replies: 22
- Views: 4529
I wish I had known this earlier
I am really depressed at the moment. I just accidentally signed up for the 9 week online course for the Manhattan Review thinking that it was MGMAT. It was really expensive too $975. It's only when I got the Turbocharge your GMAT series that I realised that it was not the same company. I don't know ...
- by hiojay
Tue Apr 28, 2009 10:08 pm- Forum: Ask a Manhattan Prep representative
- Topic: Are Manhattan Review and Manhattan GMAT same?
- Replies: 3
- Views: 3801
459
I'm counting 459 numbers too. I see 4C2 or 6 possible combinations that we need to address. 1. 33XX 2. 3X3X 3. 3XX3 4. X33X 5. X3X3 6. XX33 Looking at the number of possibilities for each combination: 1. 1 x 1 x 9 x 9 = 81 2. 1 x 9 x 1 x 9 = 81 3. 1 x 9 x 9 x 1 = 81 4. 8 x 1 x 1 x 9 = 72 5. 8 x 1 x ...
- by hiojay
Tue Apr 28, 2009 1:20 am- Forum: Problem Solving
- Topic: '3' exactly twice
- Replies: 22
- Views: 4529