og ds # 122

[simba12123]

If v and w are different integers, does v=0?


statement 1: vw=v^2

statement 2: w=2


my wrong answer is c

qa is a how in the world is that possible?
statements 1 boils down to v=w but one woulld need w in order to see what v is. need to see the light on this one

[stop@800]

A
vw=v^2

v^2 - vw = 0

v(v-w) = 0
means

v = 0 or v = w

v != w as given in the question "v and w are different integers"
hence v =0

You are actually ignoring the zero
Keep in mind: We CANNOT cancel variables in case of inequalities.

[jsl]

Ahh - I fell for the trap too!

Where did you get this question from? It feels like a really good representation of an actual GMAT question

[yezz]

If v and w are different integers, does v=0?


statement 1: vw=v^2

statement 2: w=2


from1

v(w-v) = 0 thus either v = 0 or w = v, from the stem w is not = v thus ..suff

from2

obvioulsy insuff

A

[rohangupta83]

(A)

[stop@800]

Ahh - I fell for the trap too!

Where did you get this question from? It feels like a really good representation of an actual GMAT question

IMO its an OG question.

[simba12123]

Folks this question is the official guide question number 122.

I simplified statement 1 down to v=w and then reasoned that i need to have w in order to know what v is. then choice c looks very attractive.

what am i missing here. I cant even see the trap let alone fall for it.

[rohangupta83]

Folks this question is the official guide question number 122.

I simplified statement 1 down to v=w and then reasoned that i need to have w in order to know what v is. then choice c looks very attractive.

what am i missing here. I cant even see the trap let alone fall for it.

you can't see the trap cuz you've already fallen for it ':lol:' by simplifying the equation VW = V^2

instead VW = V^2

it is given that V!=W (V is not equal to W)

Therefore, the only time when VW = V^2 is when V = 0

For any other value V will have to be equal to W (which our question says can not happen)

So, V = 0, hence statement 1 is sufficient - Answer Choice A

[simba12123]

I see now.. wonderful

[farooq]

If v and w are different integers, does v=0?


statement 1: vw=v^2

statement 2: w=2


my wrong answer is c

qa is a how in the world is that possible?
statements 1 boils down to v=w but one woulld need w in order to see what v is. need to see the light on this one

Ahh..I made a silly mistake...GMAC know how to trap students.

Thanks to Beatthegmat.com site.