S1 and S2 Contradicting each other

Expert replies

mchaubey: Junior | Next Rank: 30 Posts; Posts: 16; Joined: Sun Jan 24, 2010 9:36 am

by mchaubey » Thu May 06, 2010 10:30 am

How many positive integer factors does k have?

(1) k has the same number of positive integer factors as 3^3.

(2) k = rs, where r and s are different prime numbers.

Like this post

Source: Beat The GMAT — Data Sufficiency | Thu May 06, 2010 10:30 am

mchaubey: Junior | Next Rank: 30 Posts; Posts: 16; Joined: Sun Jan 24, 2010 9:36 am

by mchaubey » Thu May 06, 2010 10:31 am

Here S1 says k has 27 factors thus sufficient
While S2 says k has prime factors r and s thus possible factors are 1, r, s, k only four factors

So which one is correct?

Like this post

electrico: Senior | Next Rank: 100 Posts; Posts: 53; Joined: Tue Feb 17, 2009 11:14 pm; Location: India; Thanked: 2 times

by electrico » Fri May 07, 2010 12:55 am

Here S1 says k has 27 factors thus sufficient

Man, S1 says that K has the same number of positive integer factors as 3^3 = 27, which has 4 factores - 1,3,9,27.

S1 and S2 are not contradicting. The answer is D.

Like this post

debmalya_dutta: Master | Next Rank: 500 Posts; Posts: 385; Joined: Sun Jul 12, 2009 10:16 pmFollowed by: 2 members; Thanked: 29 times; GMAT Score:710

by debmalya_dutta » Fri May 07, 2010 4:35 pm

answer is D

(1) k has the same number of positive integer factors as 3^3.
one can determine the number of factors of 27 and the k has the same number of factors
hence , sufficient

(2) k = rs, where r and s are different prime numbers
means r and s are the only prime factors
sufficient by itself

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