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Re: Combinations, Permutations, and Probability - References [#permalink]
28 Dec 2010, 16:22

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.

Re: Combinations, Permutations, and Probability - References [#permalink]
17 Nov 2011, 09:06

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!

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%.

Re: Combinations, Permutations, and Probability - References [#permalink]
22 Feb 2012, 01:05

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).

Re: COMBINATION and PROBABILITY - references. If you have [#permalink]
27 Dec 2013, 17:40

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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