It is currently 18 Oct 2017, 17:43

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Another Exponent Problem

Author Message
Current Student
Joined: 03 Dec 2007
Posts: 83

Kudos [?]: 6 [0], given: 0

Schools: NYU STERN

### Show Tags

04 Feb 2009, 18:24
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Which is equal to (2^k)[5^(k-1)]?

a) 2[10^(k-1)]
b) 5[10^(k-1)]
c) $$10^k$$
d) $$2(10^k)$$
e) 10^(2k-1)

Kudos [?]: 6 [0], given: 0

GMAT Tutor
Joined: 24 Jun 2008
Posts: 1339

Kudos [?]: 1952 [1], given: 6

### Show Tags

04 Feb 2009, 20:30
1
KUDOS
Expert's post
hardaway7 wrote:
Which is equal to (2^k)[5^(k-1)]?

a) 2[10^(k-1)]
b) 5[10^(k-1)]
c) $$10^k$$
d) $$2(10^k)$$
e) 10^(2k-1)

$$2^k \times 5^{k-1} = 2 \times 2^{k-1} \times 5^{k-1} = 2 \times 10^{k-1}$$
_________________

GMAT Tutor in Toronto

If you are looking for online GMAT math tutoring, or if you are interested in buying my advanced Quant books and problem sets, please contact me at ianstewartgmat at gmail.com

Kudos [?]: 1952 [1], given: 6

Current Student
Joined: 03 Dec 2007
Posts: 83

Kudos [?]: 6 [0], given: 0

Schools: NYU STERN

### Show Tags

04 Feb 2009, 21:10
Perfect - THANKS!!!

Kudos [?]: 6 [0], given: 0

Re: Another Exponent Problem   [#permalink] 04 Feb 2009, 21:10
Display posts from previous: Sort by