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24 Jan 2012, 14:18
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Two questions?
Q.1 What topics within combinotronics to cover for GMAT? Since there are so many variations in combinations, permutations, circular & linear arrangements.
Q.2 How to deduce the final result quickly if our formula shows something like this:
= 8! - (7!*2) - (5!*2) = ??
Q.1 What topics within combinotronics to cover for GMAT? Since there are so many variations in combinations, permutations, circular & linear arrangements.
Q.2 How to deduce the final result quickly if our formula shows something like this:
= 8! - (7!*2) - (5!*2) = ??
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.
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24 Jan 2012, 14:41
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docabuzar
Hi, and welcome to GMAT Club!
Q #1: Try Combinatorics chapter of Math Book to have an idea about the staff that is tested on the GMAT: math-combinatorics-87345.html
Also try some questions on combinations to practice:
DS: search.php?search_id=tag&tag_id=31
PS: search.php?search_id=tag&tag_id=52
Hard questions on combinations and probability with detailed solutions: hardest-area-questions-probability-and-combinations-101361.html
In addition, note that usually the GMAT combination/probability questions are fairly straightforward and as practice shows you won't encounter more than 2-3 questions from this field.
Q #2: 8! - (7!*2) - (5!*2) --> factor out 5!*2 --> 5!*2*(6*7*4-6*7-1)=240*125=30,000.
Hope it helps.
P.S. Please post general math questions in the main Math forum. Thanks.
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 above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
