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Register now and save up to $200 Available with Beat the GMAT members only code • Magoosh Study with Magoosh GMAT prep Available with Beat the GMAT members only code • Free Veritas GMAT Class Experience Lesson 1 Live Free Available with Beat the GMAT members only code • 5 Day FREE Trial Study Smarter, Not Harder Available with Beat the GMAT members only code • Get 300+ Practice Questions 25 Video lessons and 6 Webinars for FREE Available with Beat the GMAT members only code • Free Practice Test & Review How would you score if you took the GMAT Available with Beat the GMAT members only code • 5-Day Free Trial 5-day free, full-access trial TTP Quant Available with Beat the GMAT members only code • 1 Hour Free BEAT THE GMAT EXCLUSIVE Available with Beat the GMAT members only code • Free Trial & Practice Exam BEAT THE GMAT EXCLUSIVE Available with Beat the GMAT members only code ## Sample 275 mba.com This topic has 2 expert replies and 5 member replies anuprajan5 Master | Next Rank: 500 Posts Joined 25 Jun 2012 Posted: 279 messages Followed by: 10 members Thanked: 60 times Target GMAT Score: 740 #### Sample 275 mba.com Wed Sep 12, 2012 12:41 pm I was wondering if someone could help with this question. Need free GMAT or MBA advice from an expert? Register for Beat The GMAT now and post your question in these forums! ### GMAT/MBA Expert Jim@StratusPrep MBA Admissions Consultant Joined 11 Nov 2011 Posted: 2278 messages Followed by: 265 members Thanked: 659 times GMAT Score: 770 Wed Sep 12, 2012 1:42 pm Just count the number of symbols inside the circles -> 20 20/30 = 2/3 _________________ GMAT Answers provides a world class adaptive learning platform. -- Push button course navigation to simplify planning -- Daily assignments to fit your exam timeline -- Organized review that is tailored based on your abiility -- 1,000s of unique GMAT questions -- 100s of handwritten 'digital flip books' for OG questions -- 100% Free Trial and less than$20 per month after.
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anuprajan5 Master | Next Rank: 500 Posts
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Wed Sep 12, 2012 9:20 pm
Jim,

Theres 2 issues with that - The number inside the circles would be people abobve 30 or that do not have a high school diploma or both, not under 30 or a high school graduate or both.

Regards
Anup

http://www.mba.com/the-gmat/nex-gen/samples/sample-275.aspx?next=yes

ptkm Newbie | Next Rank: 10 Posts
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Sat Sep 22, 2012 4:07 am
From the pictograph, there are 40 students who are both >30 yr old and do not have diploma.
So total number of students who are either <30 yr old, or graduate high school, or both is 260.

The probability is 260/300 or 5/6.

ptkm Newbie | Next Rank: 10 Posts
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Sat Sep 22, 2012 4:14 am
The second part, from the pictograph:
- 160 students are > 30 yr old so 140 students are < 30 year old.
- 80 students do not have diploma so 220 have diploma.

If there is no student who is both <30 yr old and has diploma, total number of students who are either <30 yr old or have diploma, or both is 140+220 = 360.

But we know this number is 260, that's because there are 360-260=100 students who satisfy both conditions.

So finally the probability is 100/300 = 1/3.

anuprajan5 Master | Next Rank: 500 Posts
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Sat Sep 22, 2012 8:25 am
PKm,

For the 2nd part of your answer, there is an essential error - the people who have no high school diploma is 90.

REgards
Anup

### GMAT/MBA Expert

Whitney Garner GMAT Instructor
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Mon Oct 08, 2012 7:46 pm
anuprajan5 wrote:
I was wondering if someone could help with this question.

Hi anuprajan5!

They have drawn this problem to be confusing!! I actually re-drew this problem to be an overlapping sets matrix, but I can show you that in a sec! We'll start with the algebra:

[b]"What is the probability of selecting a student UNDER 30, or HS GRAD, or BOTH.
Let's find the areas that fit these and count the tick marks:
UNDER 30 = NOT in the circle on the left, so the 10 across the top and the 4 in the NO HS only circle.
HS GRAD = NOT in the circle on the right, so the 10 across the top (already counted those though), and the 11 in the left circle only.
BOTH = UNDER 30 + HS GRAD = neither in the circle on the left OR on the right, so those are the 10 across the top, but we already counted those.

Add them up: 10 + 4 + (skip the 10) + 11 + (skip the 10) = 10+4+11 = 25

Each counts for 10, so 250/300 = 25/30 = 5/6 or 5 out of 6!

ALTERNATE METHOD:
Let's build a double set matrix. We use the things that can overlap to label the top left box, and then we use the logical opposites of those for the titles next to them. Since NO HS and 30+ are the overlapping traits, the I'll put NO HS on the top left going across, and 30+ at the top left going down. Then HS would go next to NO HS (then total), and <30 below 30+ (then total).

Now we just fill in:
Overlap = 5 ticks = 50 ppl.
Total NO HS = 9 ticks = 90 ppl
Total 30+ = 16 ticks = 160ppl
Neither = 10 ticks = 100ppl
TOTAL = 300ppl

And now the 1-1.5 minute set-up make the questions a cinch!!

(1) <30, HS Grad, or Both

Add these blocks up: 110+40+100 = 250/300 = 25/30 = 5/6

(2) <30 AND a HS Grad

100/300 = 1/3.

Hope this helps!

Whit

_________________
Whitney Garner
GMAT Instructor & Instructor Developer
Manhattan Prep

Contributor to Beat The GMAT!

Math is a lot like love - a simple idea that can easily get complicated

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anuprajan5 Master | Next Rank: 500 Posts
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Mon Oct 08, 2012 10:37 pm
Whitney,

You are my princess in white! I should have realized that a venn diagram with 2 paramaters could be drawn into a double matrix.

27 days before I get something that works

Regards
Anup

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