BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

og ds # 122

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 94
Joined: Tue Oct 14, 2008 1:05 pm

og ds # 122

by simba12123 » Thu Oct 23, 2008 11:24 am
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
Top
Source: — Data Sufficiency |
User avatar
Legendary Member
Posts: 871
Joined: Wed Aug 13, 2008 7:48 am
Thanked: 48 times

by stop@800 » Thu Oct 23, 2008 12:06 pm
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.
Top
Master | Next Rank: 500 Posts
Posts: 203
Joined: Wed Jun 04, 2008 1:01 am
Location: Windsor
Thanked: 5 times
GMAT Score:650

by jsl » Thu Oct 23, 2008 12:29 pm
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
Top
Senior | Next Rank: 100 Posts
Posts: 65
Joined: Sun Oct 19, 2008 2:18 pm
Thanked: 1 times

Re: og ds # 122

by yezz » Thu Oct 23, 2008 1:43 pm
simba12123 wrote: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
Top
Legendary Member
Posts: 541
Joined: Thu May 31, 2007 6:44 pm
Location: UK
Thanked: 21 times
Followed by:3 members
GMAT Score:680

by rohangupta83 » Thu Oct 23, 2008 2:49 pm
(A)
Top
User avatar
Legendary Member
Posts: 871
Joined: Wed Aug 13, 2008 7:48 am
Thanked: 48 times

by stop@800 » Thu Oct 23, 2008 9:54 pm
jsl wrote: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.
Top
Senior | Next Rank: 100 Posts
Posts: 94
Joined: Tue Oct 14, 2008 1:05 pm

og ds 122

by simba12123 » Fri Oct 24, 2008 6:26 am
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.
Top
Legendary Member
Posts: 541
Joined: Thu May 31, 2007 6:44 pm
Location: UK
Thanked: 21 times
Followed by:3 members
GMAT Score:680

Re: og ds 122

by rohangupta83 » Fri Oct 24, 2008 6:43 am
simba12123 wrote: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
Top
Senior | Next Rank: 100 Posts
Posts: 94
Joined: Tue Oct 14, 2008 1:05 pm

ok

by simba12123 » Fri Oct 24, 2008 3:25 pm
I see now.. wonderful
Top
Master | Next Rank: 500 Posts
Posts: 140
Joined: Sat Feb 28, 2009 8:51 am
Location: India
Thanked: 14 times
Followed by:3 members

Re: og ds # 122

by farooq » Thu Oct 29, 2009 3:59 am
simba12123 wrote: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.
Regards,
Farooq Farooqui.
London. UK

It is your Attitude, not your Aptitude, that determines your Altitude.
Top
Post new topic Post Reply
• Page 1 of 1