multiple

Expert replies

Previous Topic Next Topic

ketkoag: Legendary Member; Posts: 876; Joined: Thu Apr 10, 2008 8:14 am; Thanked: 13 times

by ketkoag » Fri Jun 19, 2009 4:40 pm

Is b^m the multiple of a^k?
1) b is a multiple of a
2) m>k

IMO : E please confirm the answer..

Like this post

Source: Beat The GMAT — Data Sufficiency | Fri Jun 19, 2009 4:40 pm

cramya: Legendary Member; Posts: 2467; Joined: Thu Aug 28, 2008 6:14 pmFollowed by: 11 members; Thanked: 331 times

by cramya » Fri Jun 19, 2009 7:31 pm

I would say C

is b^m = some integer * a^k

Stmt I

b = k*a

Is (ka) ^m = some integer * a^k

Is k^m * a^m / a^k = some integer

We dont know since m>k or m<k (k^m is always an integer)

INSUFF

Stmt II

m>k

No idea about a and b

INSUFF

Together:

Is k^m * a^m / a^k = some integer

yes
a^m / a^k is an integer since m>k so k^m (int) * a^m / a^k (int) = integer

Like this post

rahulg83: Legendary Member; Posts: 575; Joined: Tue Nov 04, 2008 2:58 amFollowed by: 4 members; Location: India; Thanked: 18 times; GMAT Score:710

by rahulg83 » Fri Jun 19, 2009 10:45 pm

I simply plugged in few values..
Obviously none of them alone is sufficient
Suppose a=5, b=15 (as per st I)
St II m>k, lets take m=3, k=2

only when m=1, k=2 will b^m will not be a multiple of a^k, u can check will all the other values

But what if m=-1 and k=-2 (we don't know whether m and k are positive)

b^m = 1/15; a^k = 1/25, 1/15 is not a multiple of 1/25

hence E

Please somebody correct me if i am wrong anywhere..

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