manulath wrote:
Kindly share the Answers!
I believe they are 5/6 and 1/3
Hi, there. I'm happy to contribute here.
First of all, this question, and the OA, can be found at:
http://www.mba.com/the-gmat/nex-gen/sam ... x?next=yesThis is from one of the "old" sample IR questions that GMAC released, so presumably not as representative of the IR section as the online material that accompanies the OG13.
I can guarantee the OAs are as follows:
1)
If one student is selected at random from the 300 surveyed, the chance that the student will be under 30 or a high school graduate or both is 5/6.
2)
If one student is selected at random from the 300 surveyed, the chance that the student will be both under 30 and a high school graduate is 1/3.
There are 30 "ticks" in the diagram --- for the first, we are including everyone except the folks who are over 30
and have no high school diploma -- those would be the five ticks in the central overlap oval --- so the other 25 ticks are "legal" for the first question, and 25/30 = 5/6.
For the second question, we only want folks under thirty (outside of the right circle)
and have a HS diploma (outside the left circle also) --- so the only "legal' ticks are the row of 10 ticks hovering above both circles --- 10/30 = 1/3.
Does all that make sense?
Here's a link to a free IR eBook I wrote:
http://magoosh.com/gmat/2012/gmat-integ ... ing-ebook/I hope that helps. Let me know if anyone has any IR related questions.
Mike
_________________
Mike McGarry
Magoosh Test Prep
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