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CEO
Joined: 17 Nov 2007
Posts: 3438
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth)  Class of 2011

COMBINATION and PROBABILITY  references. If you have
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Updated on: 29 Nov 2009, 14:16
COMBINATION and PROBABILITY  references.If you have problems with combination and probability you can use this reference page to find information quickly. I guess my small contribution to the GMATclub community will help other people to crack 800 score. THEORY [ Combinatorics]  [ Probability] general: Wiki CombinationWiki Permutationalso: 7t10838.htmlpermutationcombinationscoverage30315.htmlpermutationsordermatters79661.html  how to distinguish Permutations from Combinations question collections: pcprobabilitydownload57156.html NOTES FROM WALKER #1. Comprob problems always have a few different solutions. Try to solve the problems in many ways, and that will give you selfreliance.#2. Use enumeration of possibilities for the problems with complex restrictions.#3. "How can I apply here \(C^n_k\) or \(P^n_k\)?"  is a wrong question. Always understand what the formulas mean.LINKS easy  56860  6 boys and 4 girlseasy  56779  10 red, 5 blue, 12 yellow pills.easy  56728  10 marbles contains 3 red marbles and 7 blue marbleseasy  56446  4 people and integers between 1 and 4easy  56419  an iced teaeasy  55984  a contest consists of n questionseasy  55939  15 chess playerseasy  55734  3 candidates for a universityeasy  55689  a pack of candy (2)easy  55644  a fivequestion true/false sectioneasy  55515  a pack of candyeasy  54481  red and blue chipsmedium  58914  a junior class has 1,000 students and a senior class has 800 studentsmedium  58887  that include Michael also include Anthonymedium  58742  2 couples and 1person are seated in a rowmedium  58675  n(n + 1)(n + 2) is divisible by 8medium  58670  Probability of Winningmedium  58640  4 people out of the 12 meried couplesmedium  58629  two ineger setsmedium  58609  9 people in the roommedium  58529  2 objects collide on a cubemedium  58521  DS: heads than tailsmedium  58476  Marco and Maria toss a coin three timesmedium  58360  two ineger sets (2)medium  58357  coin is flipped 5 timesmedium  58352  11 women and 9 men in a certain clubmedium  58350  DS: 10 light bulbsmedium  58233  SQUAREmedium  58187  A certain company assigns employees to officesmedium  58160  3 people are to be selected out of 8 peoplemedium  58095  Bob are among the 5 participants in a cycling racemedium  58016  3 people is to be selected from 5 married couplesmedium  57997  junior class has 1000 students and senior class has 800 studentsmedium  57981  positions at univeristymedium  57980  women and men of 10 employeesmedium  57957  rain on any given day in City Xmedium  57916  a and b from a set of 4 consecutive integersmedium  57882  Anthony and Michael sit on the sixmember board of directors for company Xmedium  57799  A fair die is rolled once and a fair coin is flipped oncemedium  57695  3 dwarves and 3 Elvesmedium  57645  A contest will consist of n questionsmedium  57629  coinmedium  57615  A jar contains b black, w white, and r red marblesmedium  57601  GMPJBCmedium  57577  5 people are to be seated around a circular tablemedium  57554  Coach Millermedium  57332  A coach will make 3 substitutionsmedium  56826  7 people and friendshipmedium  56814  coin with sides marked heads and tailsmedium  56814  tails side up more than five timesmedium  56812  a election in Burghtown.medium  56709  A set consist of 2n1 elementmedium  56705  25 linesmedium  56681  2 numbers from 1,2,3,4,5medium  56590  2 red and 3 blue marblesmedium  56586  different colors from 6 flowers.medium  56585  4 particular flowers of 8 different flowersmedium  56572  fivedigit numbersmedium  56557  a committee of 4 distinct pairs of brothers and sistersmedium  56556  three letters taken from letters (a,a,b,b,c,c,d)medium  56530  12 playing cardsmedium  56530  4 cards of 12 cardsmedium  56446  4 people choose an integer between 1 and 4, inclusive.medium  56445  5 of 7 modelsmedium  56443  Two couples and one single person in a row of five chairs.medium  56349  3 girls and 4 boys in a rowmedium  56327  shirts, shoes, pantsmedium  56122  Six mobsters: Frankie behind Joeymedium  56037  a team from men and womenmedium  55870  3 carsmedium  55823  4 senior partners and 6 junior partnersmedium  55811  5 women are in a racemedium  55803  a committee from 4 married couplesmedium  55764  100 numbered cubesmedium  55743  A and B stocksmedium  55694  Two fair dicesmedium  55673  3 different marblesmedium  55644  GMATT answersmedium  55617  4 guys, 2 girls and 14 dogs.medium  55509  A committee of 3 people from 4 couplesmedium  55504  Ways from A to Dmedium  55472  4 pairs of brothers and sistersmedium  55427  4 books fom 2 paperback and 6 hardback booksmedium  55421  the probability that n(n+1)(n+2) will be divisible by 8medium  55413  3digit integermedium  55410  A committee from 5 military officers and 9 civilians.medium  55383  4 physics, 2 math and 3 chemistry booksmedium  55372  My name is AJEETmedium  55369  8 friends want to play doubles tennismedium  55366  The most expensive two booksmedium  55340  trhee letters from seven different postboxesmedium  55311  6 cardsmedium  55253  Rich has 3 green, 2 red and 3 blue balls in a bagmedium  55141  A bowl contains white and black balls.medium  55071  10 bottles of alcoholmedium  55054  3 sniper's shootsmedium  54794  a fantasy football gamemedium  54650  6 cardsmedium  54332  Bob and Jen in a racemedium  53774  The choir consists of 5 boys and 6 girlsmedium  50488  5 digit numbersmedium  45753  a committe of 3 of 6 peoplemedium  41464  deck contains 2 blue, 2 red, 2 yellow, and 2 green cardsmedium  19685  5 digit numbers formed using the digits 0, 1, 2, 3, 4, 5medium  15366  Mary and Joe throw three dice eachmedium  59065  A 4letter codehard  58616  PS Standard deviation + probabilitieshard  57713  the total number of permutations of n different thingshard  57447  A fair coin is tossed 10 timeshard  57169  DS: How many subordinates does Marcia Have_______________________________________________ See also: General:
Math:
7t44300.html  good collection of Math links. \(\to\)http://gmatclub.com/forum/7t56486.html  CombinationPermutationProbability quant problems: my list with links 7t57156.html  CombinationPermutationProbability quant problems: list of 55 different question with explanation [Amardeep Sharma]
Verbal:
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Originally posted by walker on 01 Dec 2007, 08:53.
Last edited by walker on 29 Nov 2009, 14:16, edited 27 times in total.
Links Updated



Founder
Joined: 04 Dec 2002
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Updated on: 09 Jun 2009, 17:12
Additional Practice Questions:Medium  79490  How many fourdigit odd numbers do not use any digit more than onceMeidum  79312  A jar contains only x black balls and y white balls
Originally posted by bb on 01 Dec 2007, 09:48.
Last edited by bb on 09 Jun 2009, 17:12, edited 4 times in total.
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SVP
Joined: 01 May 2006
Posts: 1775

Thanks for it !
I add a link to your thread from Preatorian's one



CEO
Joined: 17 Nov 2007
Posts: 3438
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth)  Class of 2011

Re: COMBINATION and PROBABILITY  references.
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19 Jan 2008, 03:33
I've finished with my PCP page. I'll add only interesting problems! Good Luck!
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Manager
Joined: 20 Dec 2004
Posts: 246

Re: COMBINATION and PROBABILITY  references.
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21 Jan 2008, 17:12
Walker can you add this link to your PCP page. Excellent collection. Makes life so much easier for all of us. I like the explanation you provided to this question. 7t58742
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Director
Joined: 14 Oct 2007
Posts: 722
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Schools: Oxford'10

Re: COMBINATION and PROBABILITY  references.
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21 Jan 2008, 23:33
watchout folks, walker is headed for the US presidency!



CEO
Joined: 17 Nov 2007
Posts: 3438
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth)  Class of 2011

Re: COMBINATION and PROBABILITY  references.
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21 Jan 2008, 23:45
buffdaddy wrote: watchout folks, walker is headed for the US presidency! I'm just gathering some information for me and for you .....
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Director
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Schools: Oxford'10

Re: COMBINATION and PROBABILITY  references.
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21 Jan 2008, 23:49
yeah man..its awesome!
btw, when are u looking to take the test?



CEO
Joined: 17 Nov 2007
Posts: 3438
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth)  Class of 2011

Re: COMBINATION and PROBABILITY  references.
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22 Jan 2008, 03:14
buffdaddy wrote: btw, when are u looking to take the test? 34 months. I have to SC
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Senior Manager
Joined: 10 Jun 2007
Posts: 344
Location: Newport, RI

Re: COMBINATION and PROBABILITY  references.
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22 Jan 2008, 06:01
Thanks for the links!!!



Intern
Joined: 13 Jan 2008
Posts: 24

Re: COMBINATION and PROBABILITY  references.
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22 Jan 2008, 15:34
Walker  awesome; simply awesome. Are you Walker as in Walker: Texas Ranger. Because if you are, a Chuck Norris reference comes to mind: "When Chuck Norris falls into water, he does not get wet. The water gets Chuck Norris."
Nice one man.



CEO
Joined: 17 Nov 2007
Posts: 3438
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth)  Class of 2011

Re: COMBINATION and PROBABILITY  references.
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24 Jan 2008, 10:45
Yeah, If you have interesting problems, post here links and I will add them to the list.
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Re: COMBINATION and PROBABILITY  references.
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20 Mar 2008, 09:28
walker wrote: Yeah, If you have interesting problems, post here links and I will add them to the list. fantastic post. walker flies.
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GT



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20 Mar 2008, 10:16
awesome job walker!



CEO
Joined: 17 Nov 2007
Posts: 3438
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth)  Class of 2011

Re: COMBINATION and PROBABILITY  references.
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20 Mar 2008, 11:37
Thanks! I add "NOTES FROM WALKER" to my first post for new members
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Manager
Joined: 02 Jan 2008
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Re: COMBINATION and PROBABILITY  references.
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20 Mar 2008, 11:44
Thnx Dude. You ROCK.



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Schools: R1:Cornell, Yale, NYU. R2: Haas, MIT, Ross

Re: COMBINATION and PROBABILITY  references.
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13 Apr 2008, 13:01
woww, just found this, Thanks man, this is awsome, hopefully now I can P&C



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Joined: 02 Dec 2007
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Re: COMBINATION and PROBABILITY  references.
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14 Apr 2008, 01:22
Walker you are a legend !
Kudos for you



Manager
Joined: 25 Mar 2008
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14 Apr 2008, 09:42
thanks thanks
and thank you very much
shobuj



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Re: COMBINATION and PROBABILITY  references.
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15 Apr 2008, 08:53
Great stuff. Thanks




Re: COMBINATION and PROBABILITY  references. &nbs
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15 Apr 2008, 08:53



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