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# For any numbers a and b, a*b=a+b-ab. if a*b=0, which of the

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VP
Joined: 30 Sep 2004
Posts: 1480

Kudos [?]: 425 [0], given: 0

Location: Germany
For any numbers a and b, a*b=a+b-ab. if a*b=0, which of the [#permalink]

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09 Jan 2005, 08:36
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 [?]: 425 [0], given: 0

VP
Joined: 18 Nov 2004
Posts: 1430

Kudos [?]: 49 [0], given: 0

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09 Jan 2005, 09:47
B it is. Do it quickly by using the ans choices, in B you will hit a+1 = a...not possible.

Kudos [?]: 49 [0], given: 0

Senior Manager
Joined: 30 Dec 2004
Posts: 294

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

Location: California

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09 Jan 2005, 11:09
I also get B as well...

Almost got fooled by D because couldn't think of a situation where:

a-1 = -a

but as I was writing the post I thougt of when a = 1/2...whew that was close!
_________________

"No! Try not. Do. Or do not. There is no try.

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

09 Jan 2005, 11:09
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# For any numbers a and b, a*b=a+b-ab. if a*b=0, which of the

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