It is currently 23 Mar 2018, 11:58

### 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

# For any numbers a and b, a b = a + b ab. If a b = 0, which

Author Message
Intern
Joined: 16 Jul 2008
Posts: 12
For any numbers a and b, a b = a + b ab. If a b = 0, which [#permalink]

### Show Tags

04 Sep 2008, 18:54
For any numbers a and b, a · b = a + b – ab.
If a · b = 0, which of the following CANNOT be a value of b?

(A) 2
(B) 1
(C) 0
(D) -1
(E) -(2/3)

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Director
Joined: 12 Jul 2008
Posts: 513
Schools: Wharton

### Show Tags

04 Sep 2008, 18:59
djdela wrote:
For any numbers a and b, a · b = a + b – ab.
If a · b = 0, which of the following CANNOT be a value of b?

(A) 2
(B) 1
(C) 0
(D) -1
(E) -(2/3)

B

0 = a + b - ab
0 = b + a*(1-b)
b = -a*(1-b)

If b = 1, then the equation says:
1 = 0
SVP
Joined: 17 Jun 2008
Posts: 1502

### Show Tags

05 Sep 2008, 01:30
B.

for such questions, I find substitution method more helpful.
VP
Joined: 17 Jun 2008
Posts: 1322

### Show Tags

05 Sep 2008, 21:32
djdela wrote:
For any numbers a and b, a · b = a + b – ab.
If a · b = 0, which of the following CANNOT be a value of b?

(A) 2
(B) 1
(C) 0
(D) -1
(E) -(2/3)

When b=1 then a=a+1 not possible hence (B) is CORRECT ANSWER

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________

cheers
Its Now Or Never

Re: Problem Solve   [#permalink] 05 Sep 2008, 21:32
Display posts from previous: Sort by

# For any numbers a and b, a b = a + b ab. If a b = 0, which

Moderator: chetan2u

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne 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®.