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# Combinatorics & Propability Concept - Best Book

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Intern
Joined: 02 Dec 2014
Posts: 16
GMAT 1: 700 Q47 V38
Combinatorics & Propability Concept - Best Book  [#permalink]

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23 Apr 2015, 05:14
2
Hi All,

Have difficulty in the concept of Combinatorics & Propability.

Have both Manhattan Books and Veritas Prep books, which one is better to understand the concepts based on your experience.

Also please suggest the methods to improve on Speed , distance & time problems.

Thanks,
Ram.
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Thanks & Regards,
Ramakrishnan N
Economist GMAT Tutor Instructor
Joined: 27 Mar 2015
Posts: 165
Re: Combinatorics & Propability Concept - Best Book  [#permalink]

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23 Apr 2015, 08:55
Hi ramkrn,

Most online resources offer free trials so you can test out their products and see what works best for you. I'd definitely suggest starting there and taking advantage of these trials. Everyone learns a little differently, so try a few out and go from there.

Best of luck!
Rich
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Rich
http://econgm.at/KvjVSi
Economist GMAT Tutor
(866) 292-0660
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Joined: 14 Apr 2009
Posts: 2271
Location: New York, NY
Combinatorics & Propability Concept - Best Book  [#permalink]

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23 Apr 2015, 10:02
1
Here's a great free video lesson on combinatorics and probability that we provide: http://www.gmatpill.com/gmat-practice-t ... ons-lesson

It helps you understand the difference between combinations, permutations, and variations -- and goes through several exercise problems -- as well as those same exercise questions with slight variations so that you can really test your understanding.
EMPOWERgmat Instructor
Status: GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 16711
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: Q170 V170
Re: Combinatorics & Propability Concept - Best Book  [#permalink]

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23 Apr 2015, 13:40
Hi ramkrn,

You've 'lumped together' some categories of questions without really defining WHY you're having trouble with them. The more specific you can be with your issues, the easier it will likely be to fix them and get you the resources that you need.

1) What resources have you been studying with?
2) How have you been scoring on your CATs (including the Quant and Verbal Scaled Scores)?
3) Are you getting all of these types of questions wrong or just certain variations?

I highly recommend that you post any question that gives you trouble into the appropriate Forum on this site. The Experts and other Users will likely be able to offer the advice/solutions that can help you to quickly improve.

GMAT assassins aren't born, they're made,
Rich
_________________
Contact Rich at: Rich.C@empowergmat.com

The Course Used By GMAT Club Moderators To Earn 750+

souvik101990 Score: 760 Q50 V42 ★★★★★
ENGRTOMBA2018 Score: 750 Q49 V44 ★★★★★
Intern
Joined: 02 Dec 2014
Posts: 16
GMAT 1: 700 Q47 V38
Re: Combinatorics & Propability Concept - Best Book  [#permalink]

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23 Apr 2015, 18:15
EMPOWERgmatRichC wrote:
Hi ramkrn,

You've 'lumped together' some categories of questions without really defining WHY you're having trouble with them. The more specific you can be with your issues, the easier it will likely be to fix them and get you the resources that you need.

1) What resources have you been studying with?
2) How have you been scoring on your CATs (including the Quant and Verbal Scaled Scores)?
3) Are you getting all of these types of questions wrong or just certain variations?

I highly recommend that you post any question that gives you trouble into the appropriate Forum on this site. The Experts and other Users will likely be able to offer the advice/solutions that can help you to quickly improve.

GMAT assassins aren't born, they're made,
Rich

Hi RichC,

1) What resources have you been studying with? I have used the Manhattan Quant books ( All 5 books) for concepts and practiced from OG 2015 and Quant Review 2nd edition.

2) How have you been scoring on your CATs (including the Quant and Verbal Scaled Scores)? In GMAT Prep 1 : 660 (Q47 V34) & GMAT Prep 2 : 680 (Q48 V35) In GMAT Club Test Quant : 42-44 , Manhattan 660 : (Q46 V34).

3) Are you getting all of these types of questions wrong or just certain variations?(Speed , distance & time problems at 600 + level getting wrong , Propability & Combinatorics not confident although I know some concepts but again error in 600+ problems)

Thanks,
Ram.
_________________
Thanks & Regards,
Ramakrishnan N
EMPOWERgmat Instructor
Status: GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 16711
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: Q170 V170
Re: Combinatorics & Propability Concept - Best Book  [#permalink]

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23 Apr 2015, 20:16
1
Hi ramkrn,

With your scores, you're performing at a really nice level. In this 'range' though, the GMAT becomes really sensitive to little mistakes, so you have to take a good look at EVERYTHING you're getting wrong and figure out WHY. If you're making silly mistakes (for whatever reason), then THOSE are things that you have to work on immediately. Don't worry about the implied 'level' of any given question - focus instead on whether the question is "gettable" or not - if you want to improve your score, then you have to nail all of those gettable questions.

From your scores, my guess is that your 'problems' are more organizational than anything else. It would be useful to see not only the questions that you're having trouble with but also the work that you tried to do to solve the questions in the first place. If and when you post prompts in the Forums, you should also post whatever specific 'issues' you had or aspects of the prompts that you want to know more about.

GMAT assassins aren't born, they're made,
Rich
_________________
Contact Rich at: Rich.C@empowergmat.com

The Course Used By GMAT Club Moderators To Earn 750+

souvik101990 Score: 760 Q50 V42 ★★★★★
ENGRTOMBA2018 Score: 750 Q49 V44 ★★★★★
Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 10436
Location: Pune, India
Re: Combinatorics & Propability Concept - Best Book  [#permalink]

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23 Apr 2015, 20:16
1
2
ramkrn wrote:
Hi All,

Have difficulty in the concept of Combinatorics & Propability.

Have both Manhattan Books and Veritas Prep books, which one is better to understand the concepts based on your experience.

Also please suggest the methods to improve on Speed , distance & time problems.

Thanks,
Ram.

Since you already have both books, why don't you check out both of them? From what I understand, Combinatorics is a section in a Manhattan book so it shouldn't take much time. Depending on whether you have the old version of Veritas books or the new one, you will have either a dedicated book for the topic or it will be combined with Statistics. In either case, it will cover the basics extensively. In addition, you can check out some posts on my blog: http://www.veritasprep.com/blog/categor ... om/page/5/

Also, Time Speed and Distance questions can be easily handled using ratios.
http://www.veritasprep.com/blog/2011/03 ... of-ratios/
http://www.veritasprep.com/blog/2011/03 ... os-in-tsd/
http://www.veritasprep.com/blog/2012/07 ... elatively/
http://www.veritasprep.com/blog/2012/08 ... -speeding/
http://www.veritasprep.com/blog/2012/08 ... -concepts/
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Karishma
Veritas Prep GMAT Instructor

Re: Combinatorics & Propability Concept - Best Book   [#permalink] 23 Apr 2015, 20:16