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27 Apr 2009, 19:48
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Lately, I've been spending a good amount of time learning Overlapping Sets for Quant. I'm wondering if these question-types come up often on the real GMAT... should I really worry? How frequent do they appear??
I've tried doing a chart matrix to solve these questions, and the other formula approach: T = G1 + G2 - B + N. If anyone has suggestions on tips to tackle Overlapping Sets, I would appreciate any help. Thank you!
I've tried doing a chart matrix to solve these questions, and the other formula approach: T = G1 + G2 - B + N. If anyone has suggestions on tips to tackle Overlapping Sets, I would appreciate any help. Thank you!
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27 Apr 2009, 20:55
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These are mid-high difficulty questions, so they don't appear often.
I have not really encountered these questions before my GMAT, so i had some trouble with them as well. In particular I could never remember which group gets deducted using the formula - is it both or is it neither. I just could not memorize it even though it was well explained in the Kaplan Premier book.
What I had to do was memorize the example Kaplan gave. I memorized the exact words for the problem and then I memorized the solution and the final answer. Then, when I encountered these questions, I very quickly in minimal shape wrote out my problem and solution from memory (the equation basically) and use that model to plug the numbers in. These are very much template driven problems, so this approach worked perfectly for me - group 1, group 2, neither, and both and voila. if I ever have a doubt which group needs to be plugged in, I change the numbers in the new problem to match the old one and since I already know the answer for those numbers, all I have to do is match it. Fairly quickly I could do the whole plug in/out in my head, but I never had to worry about these questions again.
That's all you need to know about overlapping sets for the GMAT.
I have not really encountered these questions before my GMAT, so i had some trouble with them as well. In particular I could never remember which group gets deducted using the formula - is it both or is it neither. I just could not memorize it even though it was well explained in the Kaplan Premier book.
What I had to do was memorize the example Kaplan gave. I memorized the exact words for the problem and then I memorized the solution and the final answer. Then, when I encountered these questions, I very quickly in minimal shape wrote out my problem and solution from memory (the equation basically) and use that model to plug the numbers in. These are very much template driven problems, so this approach worked perfectly for me - group 1, group 2, neither, and both and voila. if I ever have a doubt which group needs to be plugged in, I change the numbers in the new problem to match the old one and since I already know the answer for those numbers, all I have to do is match it. Fairly quickly I could do the whole plug in/out in my head, but I never had to worry about these questions again.
That's all you need to know about overlapping sets for the GMAT.
27 Apr 2009, 21:07
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Thank you very much BB for the great insight!!! BIG Kudos to you and this board! 
) then the ratio of club members is 3/4 golf and tennis respectively. (1/2t=2/3g => t=4/3g 
