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Re: Combinations, Permutations, and Probability - References [#permalink]

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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]

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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]

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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]

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27 Dec 2013, 17:40

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Re: COMBINATION and PROBABILITY - references. If you have [#permalink]

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02 Jan 2015, 02:00

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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Re: COMBINATION and PROBABILITY - references. If you have [#permalink]

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10 Jan 2016, 00:35

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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Re: COMBINATION and PROBABILITY - references. If you have [#permalink]

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22 Jan 2017, 02:39

Hi,

I have doubts regarding the following questions.Please suggest how to go about it.

1)Using the digits 2,3,4,5,6 find the following:- a)Sum of all 5 digit nos. that can be formed such that no 2 digits are the same. b)Sum of all 4 digit nos. that can be formed such that no 2 digits are the same. c)Sum of all 4 digit nos. that can be formed such that digits can be repeated.

The book I am referring to has used the below formula to solve the above question:_

(2+3+4+5+6)= sum of digits (11111)= As many 1's as there are digits in the number. (4!) =no. of times any digit appears in any place.

But I don't understand the exact usage of the formula.

2)A group of 11 people went to a party.There were 5 girls and 6 boys who were seated on a rectangular table with 6 chairs on either side of the longer edge. a) What is the total no. of ways the group could be seated(Sides are indistinguishable)? b)What is the no. of ways they can be seated so that all the 5 girls were sitting on the same side?

Thanks in advance.

gmatclubot

Re: COMBINATION and PROBABILITY - references. If you have
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22 Jan 2017, 02:39

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