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05 Jan 2017, 18:26
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I am having real struggle with Combinatorics. I am using Manhattan GMAT Complete Guide - Fourth Edition and Combinatorics is one chapter in World Translation Strategy Guide. I have gone through twice but for some reasons, I am not able to get it through my thick skull. I am finding that every problem has a different way of solving strategy. I am not able to solve the problems on my own. I am able to follow through the answer guides and understand the solution when I see it but when I see the next question, I am lost again and not able to figure out where to start for solving.
Do you guys suggest any additional strategy for overcoming this roadblock and any addition material I should be following? I know if I am not conceptually clear in Combinatorics, I will have real struggle in probability as well and it will not help me securing good scores in GMAT Quant.
Some of the outstanding issues I am working on right now includes
a. When to use Permutations / Combinations.
b. Mix of Permutations / Combinations.
Thanks in advance
Do you guys suggest any additional strategy for overcoming this roadblock and any addition material I should be following? I know if I am not conceptually clear in Combinatorics, I will have real struggle in probability as well and it will not help me securing good scores in GMAT Quant.
Some of the outstanding issues I am working on right now includes
a. When to use Permutations / Combinations.
b. Mix of Permutations / Combinations.
Thanks in advance
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
06 Jan 2017, 02:41
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kuvshah
Combinatorics Made Easy!
Theory on Combinations
DS questions on Combinations
PS questions on Combinations
Tough and tricky questions on Combinations
Probability Made Easy!
Theory on probability problems
Data Sufficiency Questions on Probability
Problem Solving Questions on Probability
Tough Probability Questions
Hope it helps.
10 Jan 2017, 12:10
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You might find Khan Academy's resources useful: https://www.khanacademy.org/math/precalculus/prob-comb
Also, two things to keep in mind:
- Combinatorics is relatively rare on the test (I recently took the GMAT myself and saw only one combinatorics OR probability question on the whole Quant section). If you have weaknesses in any other more common areas, deal with those first.
- A lot of easier combinatorics problems, and some harder ones, can be solved by just writing out all of the cases on your paper. You have a good point, that it sometimes seems like there's a different formula for every problem. People who are really strong with combinatorics get through this by knowing a couple of basic ideas/formulas and when to change them for different situations. However, it's often easier to just write everything out, if the numbers are small, than it is to memorize formulas.
Also, two things to keep in mind:
- Combinatorics is relatively rare on the test (I recently took the GMAT myself and saw only one combinatorics OR probability question on the whole Quant section). If you have weaknesses in any other more common areas, deal with those first.
- A lot of easier combinatorics problems, and some harder ones, can be solved by just writing out all of the cases on your paper. You have a good point, that it sometimes seems like there's a different formula for every problem. People who are really strong with combinatorics get through this by knowing a couple of basic ideas/formulas and when to change them for different situations. However, it's often easier to just write everything out, if the numbers are small, than it is to memorize formulas.
