PLs help : Kaplan Q !

Expert replies

Previous Topic Next Topic

himu: Master | Next Rank: 500 Posts; Posts: 345; Joined: Sun Dec 21, 2008 10:57 pmFollowed by: 3 members; Thanked: 6 times

by himu » Sun Dec 08, 2013 9:36 pm

If p is an integer and m= -p+(-2)^p

Is m^3 > 1 ?

1.p is even.

2.p^3 <= -1

Like this post

Source: Beat The GMAT — Data Sufficiency | Sun Dec 08, 2013 9:36 pm

sahilchaudhary: Master | Next Rank: 500 Posts; Posts: 153; Joined: Mon Apr 11, 2011 7:13 amFollowed by: 7 members; Location: India; Thanked: 22 times; GMAT Score:540

by sahilchaudhary » Mon Dec 09, 2013 1:19 am

We have to found whether m^3>1. If m^3>1 then we have a yes, if m^3<=1, then we have a no.

1. Put p=0 in the equation m= -p+(-2)^p, you get m=1, so m^3=1, so the answer is no.
Put p=2 in the equation m= -p+(-2)^p, you get m=2, so m^3=8, so the answer is yes.
Since we do not have a definite answer, statement 1 is not sufficient.

2. p^3<=-1 can be written as:
a. p^3=-1, so p=-1. Put p=-1 in the equation m= -p+(-2)^p, you get m=3/2, so m^3>1, so the answer is yes.
b. p^3<-1, so p<-1. Put p=-2 (since p could only be an integer) in the equation m= -p+(-2)^p, you get m=9/4, so m^3>1, so the answer is yes.
Since we have a definite yes, statement 2 is sufficient.

So, the answer is B .

Sahil Chaudhary
If you find this post helpful, please take a moment to click on the "Thank" icon.
https://www.sahilchaudhary007.blocked

Like this post

himu: Master | Next Rank: 500 Posts; Posts: 345; Joined: Sun Dec 21, 2008 10:57 pmFollowed by: 3 members; Thanked: 6 times

by himu » Mon Dec 09, 2013 5:06 am

Hi Sahil,

Thanks for your ans & that is the correct ans.

but my Q is zero is neither even nor odd

so how can we put p=0 ?

Please suggest

thanks & Regards
~Himu.

Like this post

GMAT/MBA Expert

Brent@GMATPrepNow: GMAT Instructor; Posts: 16207; Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members; Location: Vancouver, BC; Thanked: 5254 times; GMAT Score:770

by Brent@GMATPrepNow » Mon Dec 09, 2013 6:39 am

himu wrote:Hi Sahil,

Thanks for your ans & that is the correct ans.

but my Q is zero is neither even nor odd

so how can we put p=0 ?

Please suggest

thanks & Regards
~Himu.

Hi Himu,

Allow me to jump in and say that zero is, indeed, even.

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

Like this post

sahilchaudhary: Master | Next Rank: 500 Posts; Posts: 153; Joined: Mon Apr 11, 2011 7:13 amFollowed by: 7 members; Location: India; Thanked: 22 times; GMAT Score:540

by sahilchaudhary » Mon Dec 09, 2013 6:59 am

himu wrote:Hi Sahil,

Thanks for your ans & that is the correct ans.

but my Q is zero is neither even nor odd

so how can we put p=0 ?

Please suggest

thanks & Regards
~Himu.

Hi Himu,

Any number divisible by 2 is even. So, 0 is even.
Any number not divisible by 2 is odd.

I would recommend everyone to read page 108 of OG 13 at least once before going for the actual GMAT exam.

Sahil Chaudhary
If you find this post helpful, please take a moment to click on the "Thank" icon.
https://www.sahilchaudhary007.blocked

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

560 reviews

1168 reviews

431 reviews

359 reviews

147 reviews

5/5

5 Star (560 Reviews)

"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."

"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."

"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."

Write a Review