Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 05 Jul 2015, 00:50

### 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
Your Progress

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

# What is the value of a^-2*b^-3 ? (1) (a^-3)*(b^-2) = 36^-1

 Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:
Manager
Joined: 10 Oct 2005
Posts: 62
Followers: 1

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

What is the value of a^-2*b^-3 ? (1) (a^-3)*(b^-2) = 36^-1 [#permalink]  12 Oct 2005, 12:13
What is the value of a^-2*b^-3 ?

(1) (a^-3)*(b^-2) = 36^-1
(2) ab^-1 = 6^-1

Last edited by trickygmat on 14 Oct 2005, 06:50, edited 1 time in total.
Manager
Joined: 20 Sep 2005
Posts: 56
Followers: 0

Kudos [?]: 3 [0], given: 0

[#permalink]  12 Oct 2005, 12:24
I think it's C (both). What's OA
Senior Manager
Joined: 02 Oct 2005
Posts: 297
Followers: 1

Kudos [?]: 8 [0], given: 0

[#permalink]  12 Oct 2005, 12:25
Could you please repost the question? Should we interpret:
a^-3b^-2 = 36^-1
as (a^-3) * (b^-2) ? or (a ^ (-3 (b^-2) ) ) ?

I guess it should be former.
Manager
Joined: 04 May 2005
Posts: 133
Location: Chicago
Followers: 1

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

[#permalink]  13 Oct 2005, 05:50
C

1. insuff. (a^-3)(b^-2)= 1/36, from this we can gather (a^3)(b^2)=36. Still we can't gatehr any info because the stem has (a^-2)(b^-3). 2 variables, one equation...insuff.

2. insuff. again 2 variables, one equation....insuff

together, 2 equations, 2 variables....suff.
C
OA?
_________________

Christopher Wilson

Current Student
Joined: 29 Jan 2005
Posts: 5240
Followers: 23

Kudos [?]: 191 [0], given: 0

[#permalink]  13 Oct 2005, 06:04
If we read statement 1 as a raised to the power of -3b, raised to the power of -2, then wouldn`t it be sufficient?

A?

Last edited by GMATT73 on 13 Oct 2005, 06:41, edited 1 time in total.
Manager
Joined: 10 Oct 2005
Posts: 62
Followers: 1

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

[#permalink]  13 Oct 2005, 06:39
a^-3b^-2 = 36^-1 = (a^-3) * (b^-2) = 1/36
Manager
Joined: 19 Jul 2005
Posts: 54
Followers: 1

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

Re: d/s - value [#permalink]  13 Oct 2005, 14:09
trickygmat wrote:
What is the value of a^-2*b^-3 ?

(1) a^-3b^-2 = 36^-1
(2) ab^-1 = 6^-1

It's A

a^-3b^-2=36^-1

a^(-3b*-2)=6^-2

a^6b=6^-2

so a=6

and 6b=-2 or b= -1/3

So sufficient

Statement II

ab^-1 = 6^-1

1/ab=1/6
or ab=6 two variables so insufficient

Hence insufficient

Please provide OA
Senior Manager
Joined: 02 Oct 2005
Posts: 297
Followers: 1

Kudos [?]: 8 [0], given: 0

[#permalink]  13 Oct 2005, 14:28
Answer should be C
(considering a^-3b^-2 = 36^-1 as (a^-3) * (b^-2) from trickygmat's post)

Multiply stmt 1 * stmt 2 we get
(a^-2)*(b^-3) = (36^-1)(6^-1) = (216^-1)

ALI, I think you made a mistake here:
a^-3b^-2=36^-1
a^(-3b*-2)=6^-2

a^-3b^-2=36^-1 should be (a^-3) * (b^-2) = 36^-1
Manager
Joined: 10 Oct 2005
Posts: 62
Followers: 1

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

[#permalink]  14 Oct 2005, 07:35
sudhagar, could you pls show the working... how did you arrive at 1/(a^2*b^3) = 1/216???
[#permalink] 14 Oct 2005, 07:35
Similar topics Replies Last post
Similar
Topics:
What is the value of a^-2 * b^-3 ? (1) a^-3 * b^-2 = 36^-1 3 21 Sep 2008, 03:25
20 / 2^5 = (1/ 2^m ) + ( 1 / 2^n ) What is m+n ? A) 2 b) 3 10 22 Jun 2008, 22:53
What is the greatest prime factor of 4^17-2^28? a) 2 b) 3 c) 1 04 Jan 2008, 13:00
What is the greatest prime factor of 4^17 - 2^28? a) 2 b) 3 2 04 Nov 2006, 18:51
what is the greatest prime factor of 4^17-2^28? a. 2 b. 3 c. 4 06 Jun 2006, 19:21
Display posts from previous: Sort by

# What is the value of a^-2*b^-3 ? (1) (a^-3)*(b^-2) = 36^-1

 Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group and phpBB SEO Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.