Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 350,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

Calculator for a DS solution? [#permalink]
04 Sep 2012, 20:21

Hi! I'll illustrate my confusion by using a DS question:

Are all angles of triangle ABC smaller than 90 degrees?

(1) 2AB=3BC=4AC

(2) AC2+AB2>BC2

So the first given is sufficient, because if we have the ratio of all of the sides of a triangle, then we can find out all of the angles. However, we would need a calculator to that with a bit of trig right? This question is from the gmatclub tests, and it says 1) is sufficient. I just want to make sure that these DS questions are asking merely if the solution is attainable from the given, with or without a calculator, OR if it is specifically attainable without a calculator? I hope that makes sense. Thanks in advance!

Re: Calculator for a DS solution? [#permalink]
06 Feb 2013, 19:24

1

This post received KUDOS

Expert's post

Archit143 wrote:

HI I marked D as the answer for this one. Because we know that for right angle triangle hypotenuse is AC (say C)

How do you know which side is the hypotenuse? Can you say that BC must be the hypotenuse?

Say, think of the triangle 3-4-5. Perhaps AB = 5, BC = 4 and AC = 3 \(AC^2+AB^2>BC^2\) holds for these values. So ABC could be a right angle triangle and hence all angles will not be less than 90.

Say, if sides are AB = 4.5, BC = 4 and AC = 3 \(AC^2+AB^2>BC^2\) still holds but all angles in this case will be less than 90.

So statement 2 is not sufficient alone. _________________

Re: Calculator for a DS solution? [#permalink]
04 Sep 2012, 21:58

Expert's post

dandarth1 wrote:

Hi! I'll illustrate my confusion by using a DS question:

Are all angles of triangle ABC smaller than 90 degrees?

(1) 2AB=3BC=4AC

(2) AC2+AB2>BC2

So the first given is sufficient, because if we have the ratio of all of the sides of a triangle, then we can find out all of the angles. However, we would need a calculator to that with a bit of trig right? This question is from the gmatclub tests, and it says 1) is sufficient. I just want to make sure that these DS questions are asking merely if the solution is attainable from the given, with or without a calculator, OR if it is specifically attainable without a calculator? I hope that makes sense. Thanks in advance!

you've got it. DS questions care only that there is a single solution. Whether that solution is attainable through simple arithmetic or through complex trigonometry is irrelevant. In fact, a few concepts, such as standard deviation, will never be calculable by hand when they appear! _________________

Re: Calculator for a DS solution? [#permalink]
04 Sep 2012, 22:00

KapTeacherEli wrote:

dandarth1 wrote:

Hi! I'll illustrate my confusion by using a DS question:

Are all angles of triangle ABC smaller than 90 degrees?

(1) 2AB=3BC=4AC

(2) AC2+AB2>BC2

So the first given is sufficient, because if we have the ratio of all of the sides of a triangle, then we can find out all of the angles. However, we would need a calculator to that with a bit of trig right? This question is from the gmatclub tests, and it says 1) is sufficient. I just want to make sure that these DS questions are asking merely if the solution is attainable from the given, with or without a calculator, OR if it is specifically attainable without a calculator? I hope that makes sense. Thanks in advance!

you've got it. DS questions care only that there is a single solution. Whether that solution is attainable through simple arithmetic or through complex trigonometry is irrelevant. In fact, a few concepts, such as standard deviation, will never be calculable by hand when they appear!

Thanks!! You are like an angel from the gmat heavens

Re: Calculator for a DS solution? [#permalink]
06 Feb 2013, 08:08

HI I marked D as the answer for this one. Because we know that for right angle triangle hypotenuse is AC (say C) C^2 = a^2 + b^2 but when angle is greater than 90: C^2>a^2 +b^2

So cant we say that if it is given C^2<a^2+b^2, angles in the triangle are less than 90 deg........

gmatclubot

Re: Calculator for a DS solution?
[#permalink]
06 Feb 2013, 08:08

The Stanford interview is an alumni-run interview. You give Stanford your current address and they reach out to alumni in your area to find one that can interview you...

Originally, I was supposed to have an in-person interview for Yale in New Haven, CT. However, as I mentioned in my last post about how to prepare for b-school interviews...

Interested in applying for an MBA? In the fourth and final part of our live QA series with guest expert Chioma Isiadinso, co-founder of consultancy Expartus and former admissions...