number properties

Expert replies

maus: Senior | Next Rank: 100 Posts; Posts: 44; Joined: Thu Apr 07, 2011 6:29 pmFollowed by: 1 member; Thanked: 2 times

by maus » Tue May 10, 2011 9:54 pm

Hi Everyone, so this question is really giving me trouble - help please!

N is an integer btw 2 and 100 and n is also the square of an integer - whats the value of n?

1) n = even
2) cube root of n is an integer

my answer for this was E, but the book answer was b, #2 alone is sufficient. i don't understand how they got that 2 is sufficient...

thanks

Maus
<:3)))~~~

Like this post

Source: Beat The GMAT — Data Sufficiency | Tue May 10, 2011 9:54 pm

smackmartine: Legendary Member; Posts: 516; Joined: Fri Jul 31, 2009 3:22 pmFollowed by: 13 members; Thanked: 112 times

by smackmartine » Tue May 10, 2011 11:00 pm

IMO B

According to the question 2 <n< 100 & n is also the square of an integer, so possible values are 4,9,16,25,36,49,64,81

1) n is even ----> could be 4,16,36,64 and 81 (Insufficient)
2) cube root of n is an integer --> only 64 because cube root of 64 is 4. (Sufficient)

So, B

maus wrote:Hi Everyone, so this question is really giving me trouble - help please!

N is an integer btw 2 and 100 and n is also the square of an integer - whats the value of n?

1) n = even
2) cube root of n is an integer

my answer for this was E, but the book answer was b, #2 alone is sufficient. i don't understand how they got that 2 is sufficient...

thanks ;)

Like this post

[email protected]: Senior | Next Rank: 100 Posts; Posts: 87; Joined: Sun Jul 24, 2011 10:36 am

by [email protected] » Thu Jul 28, 2011 1:46 pm

smackmartine wrote:IMO B

According to the question 2 <n< 100 & n is also the square of an integer, so possible values are 4,9,16,25,36,49,64,81

1) n is even ----> could be 4,16,36,64 and 81 (Insufficient)
2) cube root of n is an integer --> only 64 because cube root of 64 is 4. (Sufficient)

So, B

answer is c
from 1 : n could be any even value
from 2: n could be 3 0r 4 ( n cube may be 27 or 64 )
from both statement n is only 4 . hence sufficient.

maus wrote:Hi Everyone, so this question is really giving me trouble - help please!

N is an integer btw 2 and 100 and n is also the square of an integer - whats the value of n?

1) n = even
2) cube root of n is an integer

my answer for this was E, but the book answer was b, #2 alone is sufficient. i don't understand how they got that 2 is sufficient...

thanks

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