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

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SVP
Joined: 29 Aug 2007
Posts: 2473

Kudos [?]: 834 [0], given: 19

For any numbers a and b, a * b = a + b ab. If a*b=0, which [#permalink]

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10 Dec 2007, 00:17
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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 -3/2

Kudos [?]: 834 [0], given: 19

Manager
Joined: 03 Sep 2006
Posts: 233

Kudos [?]: 25 [0], given: 0

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10 Dec 2007, 00:34
Corrected:

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

b =/ 1

Last edited by Whatever on 10 Dec 2007, 00:58, edited 1 time in total.

Kudos [?]: 25 [0], given: 0

Manager
Joined: 29 Jul 2007
Posts: 182

Kudos [?]: 36 [0], given: 0

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10 Dec 2007, 00:41
GMAT TIGER 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 -3/2

B. 1

if a*b = 0

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

if b = 1, then a-1 = a --> -1 = 0

Kudos [?]: 36 [0], given: 0

SVP
Joined: 29 Aug 2007
Posts: 2473

Kudos [?]: 834 [0], given: 19

### Show Tags

10 Dec 2007, 22:07
GMAT TIGER 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 -3/2

you both are correct. its B.

Kudos [?]: 834 [0], given: 19

Re: Value of b????????????/   [#permalink] 10 Dec 2007, 22:07
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