Exponents

Expert replies

Previous Topic Next Topic

beater: Master | Next Rank: 500 Posts; Posts: 301; Joined: Tue Apr 22, 2008 6:07 am; Thanked: 2 times

by beater » Mon Dec 01, 2008 8:43 am

Is 5^k less than 1,000 ?

(1) 5^(k-1) > 3000
(2) 5^(k-1) = 5^k - 500

Like this post

Source: Beat The GMAT — Data Sufficiency | Mon Dec 01, 2008 8:43 am

agoyal2: Senior | Next Rank: 100 Posts; Posts: 59; Joined: Fri Feb 29, 2008 9:00 am; Thanked: 4 times

by agoyal2 » Mon Dec 01, 2008 11:02 am

IMO D.

From (1)
5^(k-1)>3000
=>5^k>15000

From (2)
5^(k-1) = 5^k - 500
=> 5^k - 5^(k-1) = 500
=>5^(k-1) (5-1) = 500
=>5^(k-1)=125
=>5^k = 725

Looks a little weird after solving it. I might be missing something. Whats the OA?

Like this post

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

by cramya » Mon Dec 01, 2008 4:00 pm

I think the OA is [spoiler]B)[/spoiler] from the post below

Refer to https://www.beatthegmat.com/tough-one-og ... 16616.html

Like this post

raajan_p: Senior | Next Rank: 100 Posts; Posts: 75; Joined: Wed Aug 27, 2008 7:19 am; Location: Orlando; Thanked: 6 times

by raajan_p » Mon Dec 01, 2008 5:12 pm

cramya wrote:I think the OA is [spoiler]B)[/spoiler] from the post below

Refer to https://www.beatthegmat.com/tough-one-og ... 16616.html

Cramya - I think the question mentioned in the link that you have provided is slightly different from the question being asked in this post.

The question in ur link says

Is 5^k less than 1000?
(1) 5^k+1 > 3000
(2) 5^k-1 = 5^k-500

If you see the statement 1 here, its says 5^K+1 which is different from the question in this post which is 5^K-1.

Or, I am not sure if I am missing on anything!

Like this post

raajan_p: Senior | Next Rank: 100 Posts; Posts: 75; Joined: Wed Aug 27, 2008 7:19 am; Location: Orlando; Thanked: 6 times

by raajan_p » Mon Dec 01, 2008 5:13 pm

Having said that, IMO, the answer for this Question would still be D.

Like this post

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

by cramya » Mon Dec 01, 2008 8:10 pm

Raajan,
I could be mistaken here but I think there is a typo in the question posted above.

May be the user meant to say 5^(k+1)>3000 instead of 5 ^ (k-1)

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