Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 22 May 2017, 13:17

### 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

# If ab=1, what is the value of (axb) (ayb) ?

Author Message
TAGS:

### Hide Tags

Intern
Joined: 19 Sep 2010
Posts: 14
Followers: 0

Kudos [?]: 33 [0], given: 4

If ab=1, what is the value of (axb) (ayb) ? [#permalink]

### Show Tags

31 Dec 2010, 20:58
2
This post was
BOOKMARKED
00:00

Difficulty:

45% (medium)

Question Stats:

62% (01:42) correct 38% (00:56) wrong based on 109 sessions

### HideShow timer Statistics

If ab=1, what is the value of (axb) (ayb) ?

(1) ax=by=2
(2) 2xy=4

Source is manhattan review math sheet.
[Reveal] Spoiler: OA
Manager
Joined: 18 Oct 2010
Posts: 91
Followers: 2

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

Re: don't know how to crack [#permalink]

### Show Tags

01 Jan 2011, 02:35
naaga wrote:
If ab=1, what is the value of (axb) (ayb) ?
1. ax=by=2
2. 2xy=4

source is manhattan review math sheet.

$$axb)(ayb)=(ab)(xa)(yb)=1*2*2=4 2/2xy=4 so xy=1 so (axb)(ayb)=(ab)(ab)(xy) there you go D Math Expert Joined: 02 Sep 2009 Posts: 38798 Followers: 7713 Kudos [?]: 105756 [4] , given: 11581 Re: don't know how to crack [#permalink] ### Show Tags 01 Jan 2011, 03:42 4 This post received KUDOS Expert's post naaga wrote: If ab=1, what is the value of (axb) (ayb) ? 1. ax=by=2 2. 2xy=4 source is manhattan review math sheet. any one please explain the answer, thanks in advance.. Given: \(ab=1$$. Question: $$(axb)*(ayb)=?$$

(1) ax=by=2, so $$ax=2$$ and $$by=2$$ --> $$(axb)*(ayb)=(ax)*(by)*(ab)=2*2*1=4$$. Sufficient.
(2) 2xy=4, so $$xy=2$$ --> $$(axb)*(ayb)=(ab)*(ab)*(xy)=1*1*2=2$$. Sufficient.

Now, technically answer should be D, as EACH statement ALONE is sufficient to answer the question.

But even though formal answer to the question is D (EACH statement ALONE is sufficient), this is not a realistic GMAT question, as: on the GMAT, two data sufficiency statements always provide TRUE information and these statements never contradict each other.

So we can not have answer 4 from statement (1) and answer 2 from statement (2), as in this case statements would contradict each other.

I guess statement (2) should read xy=4 instead of 2xy=4, in this case answer will be D and the statements won't contradict each other.

Hope it's clear.
_________________
GMAT Club Legend
Joined: 09 Sep 2013
Posts: 15378
Followers: 648

Kudos [?]: 204 [0], given: 0

Re: If ab=1, what is the value of (axb) (ayb) ? [#permalink]

### Show Tags

04 Sep 2015, 02:22
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Re: If ab=1, what is the value of (axb) (ayb) ?   [#permalink] 04 Sep 2015, 02:22
Similar topics Replies Last post
Similar
Topics:
The function a#b may be defined axb or a^b; what is the value of p#q? 3 18 Apr 2017, 19:07
6 If |a+1|=|b-1|, what is the value of a-b? (1) ab>0 5 25 Mar 2017, 20:01
4 If a > 0, b > 0, and 2c = (a/b)^(1/2), what is the value of b? 6 24 Feb 2017, 07:47
What is he maximum value of a/b? 1. a, a + b and a + 2b are 5 31 May 2010, 07:57
2 Is ab = 1? 13 18 Feb 2013, 05:07
Display posts from previous: Sort by