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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
VP
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Joined: 30 Sep 2004
Posts: 1488
Location: Germany
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Kudos [?]: 105 [0], given: 0

For any numbers a and b, a*b=a+b-ab. if a*b=0, which of the [#permalink] New post 09 Jan 2005, 07:36
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
VP
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Joined: 18 Nov 2004
Posts: 1441
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Kudos [?]: 22 [0], given: 0

 [#permalink] New post 09 Jan 2005, 08:47
B it is. Do it quickly by using the ans choices, in B you will hit a+1 = a...not possible.
Senior Manager
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Joined: 30 Dec 2004
Posts: 296
Location: California
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Kudos [?]: 2 [0], given: 0

 [#permalink] New post 09 Jan 2005, 10:09
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! :-D
_________________

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

  [#permalink] 09 Jan 2005, 10:09
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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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