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For most test takers, Data Insights is the most challenging section on the GMAT, with test takers scoring several points lower on average on DI than on Quant or Verbal and completing the section with less time to spare.
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29 Jan 2012, 23:28
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Am not trashing MGMAT's guides...in fact, I'm a fan. But, I think the combinatorics section could've been written a bit more clearer, coz I remember being able to solve these problems using easier techniques in the past.
I googled, and chanced upon this resource...that made my day.
https://www.mathsisfun.com/combinatoric ... tions.html
Clear, Crisp & Concise formulas for the 4 categories of problems:
[n is the size of the pool, r is the # of objects we're selecting from the pool]
1) ORDER MATTERS = Y, REPETITIONS = allowed
Formula: n raised to the power r
2) ORDER MATTERS = Y, REPETITIONS = not allowed (nPr)
Formula: n! / (n-r)!
3) ORDER MATTERS = N, REPETITIONS = allowed
Formula: (n+r-1)!/( (r!) (n-1)!)
4) ORDER MATTERS = N, REPETITIONS = not allowed (nCr)
Formula: n! / ( (r!) (n-r)! )
Thought I'd share this for others struggling to remember what you learned years ago...
I googled, and chanced upon this resource...that made my day.
https://www.mathsisfun.com/combinatoric ... tions.html
Clear, Crisp & Concise formulas for the 4 categories of problems:
[n is the size of the pool, r is the # of objects we're selecting from the pool]
1) ORDER MATTERS = Y, REPETITIONS = allowed
Formula: n raised to the power r
2) ORDER MATTERS = Y, REPETITIONS = not allowed (nPr)
Formula: n! / (n-r)!
3) ORDER MATTERS = N, REPETITIONS = allowed
Formula: (n+r-1)!/( (r!) (n-1)!)
4) ORDER MATTERS = N, REPETITIONS = not allowed (nCr)
Formula: n! / ( (r!) (n-r)! )
Thought I'd share this for others struggling to remember what you learned years ago...
Archived Topic
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Thank you for understanding, and happy exploring!
30 Jan 2012, 02:32
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fxsunny
If you are hoping to solve all P&C questions using formulas, you will be disappointed. There are a ton of them. One word in the question changes and your formula becomes useless (though there is a new formula for it then). You need to understand some basic concepts of the topic. That will help you handle most of the questions.
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30 Jan 2012, 02:41
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Only the 3rd combination I am finding difficult to explore. Rest was nicely explained in the link, thanks.Karishma, you mention about basics, apart from MGMAT guides and forum discussions, would you have any references for those? Pls advice
