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# COMBINATION and PROBABILITY - references. If you have

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Manager
Joined: 23 Oct 2009
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Re: Combinations, Permutations, and Probability - References  [#permalink]

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25 Dec 2010, 10:07
Hey! Thanks a lot for the effort! What's the source of these questions? Any of them from GMATPrep or Kaplan/MGMAT practice tests???
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Re: Combinations, Permutations, and Probability - References  [#permalink]

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27 Dec 2010, 10:25
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.
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Re: Combinations, Permutations, and Probability - References  [#permalink]

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28 Dec 2010, 14:33
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,

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

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28 Dec 2010, 16:07
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,

What docs? There are no docs.
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Re: Combinations, Permutations, and Probability - References  [#permalink]

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28 Dec 2010, 17:22
Possibly.... these are from before the time we started tagging questions and posts.[/quote]

hello bb,

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.
Attachments

abc.png [ 22.91 KiB | Viewed 2665 times ]

Manager
Joined: 23 Oct 2009
Posts: 62
Re: Combinations, Permutations, and Probability - References  [#permalink]

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29 Dec 2010, 13:16
this is great. thanks
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Re: Combinations, Permutations, and Probability - References  [#permalink]

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15 May 2011, 09:48
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
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Re: Combinations, Permutations, and Probability - References  [#permalink]

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17 Nov 2011, 10:06
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%.

But is there a other approach?
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Re: Combinations, Permutations, and Probability - References  [#permalink]

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04 Feb 2012, 10:13
Great compilation Walker....
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Re: Combinations, Permutations, and Probability - References  [#permalink]

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08 Feb 2012, 06:50
Combinations, Permutations, and Probability are definitely my weakness. Thanks for sharing all the information and questions.
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Re: Combinations, Permutations, and Probability - References  [#permalink]

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21 Feb 2012, 17:38
Thank you for sharing this! These are some of my weaknesses and I hope to improve them using your links.
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Re: Combinations, Permutations, and Probability - References  [#permalink]

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22 Feb 2012, 02:05
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).
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Re: Combinations, Permutations, and Probability - References  [#permalink]

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22 Feb 2012, 09:23
much needed. this is just what i needed. my weakest section on the quan side of the house...
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Re: COMBINATION and PROBABILITY - references. If you have  [#permalink]

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07 Nov 2016, 12:31
Thank you so much for this! Has helped a lot!

medium - 58352 - 11 women and 9 men in a certain club
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Re: COMBINATION and PROBABILITY - references. If you have  [#permalink]

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22 Jan 2017, 03:39
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?

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

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29 Jan 2018, 14:11
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Re: COMBINATION and PROBABILITY - references. If you have &nbs [#permalink] 29 Jan 2018, 14:11

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