For any numbers a and b, a*b=a+b-ab. if a*b=0, which of the : Quant Question Archive [LOCKED]
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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
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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, 07:36
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
VP
Joined: 18 Nov 2004
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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.
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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!
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09 Jan 2005, 10:09
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