• EMPOWERgmat Slider
    1 Hour Free
    BEAT THE GMAT EXCLUSIVE

    Available with Beat the GMAT members only code

    MORE DETAILS
    EMPOWERgmat Slider
  • Varsity Tutors
    Award-winning private GMAT tutoring
    Register now and save up to $200

    Available with Beat the GMAT members only code

    MORE DETAILS
    Varsity Tutors
  • e-gmat Exclusive Offer
    Get 300+ Practice Questions
    25 Video lessons and 6 Webinars for FREE

    Available with Beat the GMAT members only code

    MORE DETAILS
    e-gmat Exclusive Offer
  • PrepScholar GMAT
    5 Day FREE Trial
    Study Smarter, Not Harder

    Available with Beat the GMAT members only code

    MORE DETAILS
    PrepScholar GMAT
  • Kaplan Test Prep
    Free Practice Test & Review
    How would you score if you took the GMAT

    Available with Beat the GMAT members only code

    MORE DETAILS
    Kaplan Test Prep
  • Economist Test Prep
    Free Trial & Practice Exam
    BEAT THE GMAT EXCLUSIVE

    Available with Beat the GMAT members only code

    MORE DETAILS
    Economist Test Prep
  • Target Test Prep
    5-Day Free Trial
    5-day free, full-access trial TTP Quant

    Available with Beat the GMAT members only code

    MORE DETAILS
    Target Test Prep
  • Veritas Prep
    Free Veritas GMAT Class
    Experience Lesson 1 Live Free

    Available with Beat the GMAT members only code

    MORE DETAILS
    Veritas Prep
  • Magoosh
    Magoosh
    Study with Magoosh GMAT prep

    Available with Beat the GMAT members only code

    MORE DETAILS
    Magoosh

Can someone please give me the reasoning to this DS problem?

This topic has 3 member replies
daygoballa Junior | Next Rank: 30 Posts Default Avatar
Joined
26 Feb 2009
Posted:
10 messages
Test Date:
June 2009
Target GMAT Score:
730

Can someone please give me the reasoning to this DS problem?

Post Thu Mar 05, 2009 2:42 pm
Here's the problem:

- Of the 66 people in a certain auditorium, at most 6 people have birthdays in any one given month. Does at least one person in the auditorium have a birthday in January?

(1) More of the people in the auditorium have birthdays in February than in March.

(2) five of the people in the auditorium have birthdays in March.



The answer is (D)

Thank you for you help!

Henry

  • +1 Upvote Post
  • Quote
  • Flag
Need free GMAT or MBA advice from an expert? Register for Beat The GMAT now and post your question in these forums!
TedCornell Master | Next Rank: 500 Posts Default Avatar
Joined
09 Mar 2009
Posted:
207 messages
Followed by:
22 members
Upvotes:
115
Test Date:
March 9 2009
GMAT Score:
750
Top Reply
Post Wed Mar 25, 2009 12:26 am
On the GMAT, when you're told that 5 of the ppl have birth day in march that means exactly 5 of those people. There could be others with march birthdays, but those others cannot be among the people in the auditorium.

Similarly, if you're told "John has $10" it means he has exactly $10; he cannot have $11 or $12.

To make 6 march birthdays a possibility, the statement might've said "At least 5 of the pple have birthday in march" or "no fewer than 5 of the ppl"

  • +1 Upvote Post
  • Quote
  • Flag
Thanked by: ranpman
ranpman Newbie | Next Rank: 10 Posts Default Avatar
Joined
01 Mar 2009
Posted:
1 messages
Top Reply
Post Mon Mar 23, 2009 5:58 pm
cramya wrote:
Take the easier of the 2 statements

Stmt II

5 bday in March

Remaining 61
and 11 months includinbg Jan left

Atmost 6 can have a bday in any given month so there must be atleast 1 if not more having bday in Mar

SUFF

Stmt II

More of the people in the auditorium have birthdays in February than in March


Again to prove no one has a bday in jan try to maximize the 10 months which is 60 excluding March and Jan.

Since March cant have 6 as it should be less than Feb at the max March can be 5.

Still jan we have 1 bday.

SUFF

Choose D
I agree that (1) is SUFFICIENT.

However (2) states that "Five of the people in the auditorium have birthdays in March". (2) does not hay "ONLY five of the people in the auditorium have...".

In that case, isn't it possible that March could have 6 birthdays? In which case, (2) is INSUFFICIENT. What am I missing?

  • +1 Upvote Post
  • Quote
  • Flag
TedCornell Master | Next Rank: 500 Posts Default Avatar
Joined
09 Mar 2009
Posted:
207 messages
Followed by:
22 members
Upvotes:
115
Test Date:
March 9 2009
GMAT Score:
750
Post Wed Mar 25, 2009 12:26 am
On the GMAT, when you're told that 5 of the ppl have birth day in march that means exactly 5 of those people. There could be others with march birthdays, but those others cannot be among the people in the auditorium.

Similarly, if you're told "John has $10" it means he has exactly $10; he cannot have $11 or $12.

To make 6 march birthdays a possibility, the statement might've said "At least 5 of the pple have birthday in march" or "no fewer than 5 of the ppl"

  • +1 Upvote Post
  • Quote
  • Flag
Thanked by: ranpman

Best Conversation Starters

1 lheiannie07 112 topics
2 swerve 64 topics
3 LUANDATO 64 topics
4 ardz24 61 topics
5 AAPL 57 topics
See More Top Beat The GMAT Members...

Most Active Experts

1 image description Scott@TargetTestPrep

Target Test Prep

227 posts
2 image description Brent@GMATPrepNow

GMAT Prep Now Teacher

176 posts
3 image description Jeff@TargetTestPrep

Target Test Prep

168 posts
4 image description Rich.C@EMPOWERgma...

EMPOWERgmat

138 posts
5 image description GMATGuruNY

The Princeton Review Teacher

129 posts
See More Top Beat The GMAT Experts