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Source: — Data Sufficiency |
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by SanjeevK » Sun Jun 21, 2009 8:11 am
IMO A:

A: wv = v^2 => v(w-v) = 0.
Either v = 0 or w = v. It is given that w and v are different. Hence v = 0. Sufficient

B: w = 2. Doesn't give any info about v. Hence insufficient.
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by iamcste » Sun Jun 21, 2009 8:20 am
Agree with A

Tip: whenever you see "X and Y are different integers " in the stem

you would have one of the solutions to the eqtn as "X=Y"

hence look out which parts of the equation can be taken common
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by ghacker » Sun Jun 21, 2009 10:16 am
First the integers are different

[color=red]W is not equal to V [/color]


from II we can find V , V is not given

Take I

W*V = V^2

V(V-W) = 0 since W is not equal to V , V-W can not be equal to 0

Hence V = 0
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