Combinations, Permutations, and Probability - References

gmatdelhi · **Posted:** Sat Dec 25, 2010 10:07 am

Hey! Thanks a lot for the effort! What's the source of these questions? Any of them from GMATPrep or Kaplan/MGMAT practice tests???

bb · **Posted:** Mon Dec 27, 2010 10:25 am

gmatdelhi wrote:

Hey! Thanks a lot for the effort! What's the source of these questions? Any of them from GMATPrep or Kaplan/MGMAT practice tests???

Possibly.... these are from before the time we started tagging questions and posts.

jullysabat · **Posted:** Tue Dec 28, 2010 2:33 pm

bb wrote:

gmatdelhi wrote:

Hey! Thanks a lot for the effort! What's the source of these questions? Any of them from GMATPrep or Kaplan/MGMAT practice tests???

Possibly.... these are from before the time we started tagging questions and posts.

hello bb,

Where are the materials. I could not find any docs in this page or any links..
I really need those Probability and Combinations docs.Please help..

bb · **Posted:** Tue Dec 28, 2010 4:07 pm

jullysabat wrote:

bb wrote:

gmatdelhi wrote:

Hey! Thanks a lot for the effort! What's the source of these questions? Any of them from GMATPrep or Kaplan/MGMAT practice tests???

Possibly.... these are from before the time we started tagging questions and posts.

hello bb,

Where are the materials. I could not find any docs in this page or any links..
I really need those Probability and Combinations docs.Please help..

What docs? There are no docs.

jullysabat · **Posted:** Tue Dec 28, 2010 5:22 pm

Possibly.... these are from before the time we started tagging questions and posts.[/quote]

hello bb,

Where are the materials. I could not find any docs in this page or any links..
I really need those Probability and Combinations docs.Please help..[/quote]

What docs? There are no docs.[/quote]

The second post in this page/chain says "thanks for the material" so I was searching for probability/combination material.
pls see the print screen below.

rahul321 · **Posted:** Wed Dec 29, 2010 1:16 pm

this is great. thanks

thisguy310 · **Posted:** Sun May 15, 2011 9:48 am

thanks so much for sharing this!

Just thought I'd add this link from Khan Academy. I think these walk throughs help explain permutations and combinations as well http://www.khanacademy.org/video/permut ... robability

M3tm4n · **Posted:** Thu Nov 17, 2011 10:06 am

Hi all,

@Walker: Many thanks!! I was searching for a good description.
I am struggling with probabilities since...well, since I was at school and during University.
I will go through on this on weekend! :thumbup:

Edit:
Hi all,

I have a problem understanding the probability.

Let us say: In a box, here are 8 Red Ball and 5 White Balls.
How high is the probability to get 2 Red Balls and 2 White Balls?

I have solved this with using the Combinations formula.
p=\frac{n}{N}
n--> 2C8 * 2C5
N--> 4C13
I get 40%.

But is there a other approach?

sdas · **Posted:** Sat Feb 04, 2012 10:13 am

Great compilation Walker.... :thumbup:

MSoS · **Posted:** Wed Feb 08, 2012 6:50 am

Combinations, Permutations, and Probability are definitely my weakness. Thanks for sharing all the information and questions.

Yekrut · **Posted:** Tue Feb 21, 2012 5:38 pm

Thank you for sharing this! These are some of my weaknesses and I hope to improve them using your links.

M3tm4n · **Posted:** Wed Feb 22, 2012 2:05 am

Thanks. As many here, I have also problems understanding the structure of this kind of question.
But I understand now the combination and permutation topic (thanks to MGMAT book). It is just how you count the ways.
Probability is much harder. Even if it is based on counting / enumeration, it is hard to understand a word question (I mean the translation into math).

fxsunny · **Posted:** Wed Feb 22, 2012 9:23 am

much needed. this is just what i needed. my weakest section on the quan side of the house...

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Combinations, Permutations, and Probability - References

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