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## Math!

This topic has 5 member replies
bluestocking Newbie | Next Rank: 10 Posts
Joined
29 Dec 2006
Posted:
7 messages

#### Math!

Sat Dec 30, 2006 1:13 pm
My experience with the GMAT tells me that the questions on the quant section are NOT of an exceptionally tough variety - just the very SMART variety.

One must, MUST (I cannot emphasis this enough) R E A D the question properly.

Something I need to learn myself (mum's voice going 'haste makes waste' is playing in my head right now!) - Towards this end I would like to start a new thread - problems that may or may not be very tough = but require understanding (and remembering while solving) the question properly.

Lets start the series with :

PS - 1

Is |n| < 1 ?

(1) nx - n < 0

(2) x-1 = -2

(A) Statement (1) ALONE is sufficient to answer the question, but statement (2) alone is not.
(B) Statement (2) ALONE is sufficient to answer the question, but statement (1) alone is not.
(C) Statements (1) and (2) TAKEN TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient.
(D) EACH statement ALONE is sufficient to answer the question.
(E) Statements (1) and (2) TAKEN TOGETHER are NOT sufficient to answer the question.

(picked from MahattanGMAT)

thankont Senior | Next Rank: 100 Posts
Joined
15 Dec 2006
Posted:
41 messages
Followed by:
1 members
Sun Dec 31, 2006 5:25 am
I think ans. is --E--
|n|<1 => -1 Now 1) nx-n<0 => n(x-1)<0 so either n>0 and x<1 or n<0 and x>1
(A does not hold, take for example. n=3 x=-2)
2) x-1=-2 so x=-1 (this does not say anything about n so B does not hold)
combining both statements we just get n>0 (which does not hold for ex. n=2
so I put --E--

Last edited by thankont on Mon Jan 15, 2007 12:15 am; edited 1 time in total

bluestocking Newbie | Next Rank: 10 Posts
Joined
29 Dec 2006
Posted:
7 messages
Sun Dec 31, 2006 9:09 am
hiya!

good effort, though thats not the correct ans

would you like to give it another shot before I put up the correct ans?

hint : consider + / - values for everything - including the indice (just re read the question stem - it seems like it didn't copy paste correctly and I lost the original formatting)

Question:

Is |n| < 1 ?

(1) n^x - n < 0
(n raised to the power of x) - n < 0

(2) x^-1 = -2
(x raised to the power of -1) = -2

Hope you are able to solve it this time.

aim-wsc Legendary Member
Joined
20 Apr 2006
Posted:
2470 messages
Followed by:
14 members
85
Target GMAT Score:
801-
Fri Jan 12, 2007 11:06 pm
Great efforts girl
Nice initiative.

OK now that the question is changed altogether
Anybody want to try it one more time?

bytheway with earlier question @ post #1 thanktont's reasonings are correct. the answer should be E for that.

bluestocking wrote:
Question:

Is |n| < 1 ?

(1) n^x - n < 0
(n raised to the power of x) - n < 0

(2) x^-1 = -2
(x raised to the power of -1) = -2

Hope you are able to solve it this time.
PS:
Dear Pramila,
I am thinking of arranging an offline meet at Mumbai click here to know more

_________________
Getting started @BTG?

Please do not PM me, (not active anymore) contact Eric.

thankont Senior | Next Rank: 100 Posts
Joined
15 Dec 2006
Posted:
41 messages
Followed by:
1 members
Mon Jan 15, 2007 12:23 am
I am not sure here but from n^x 01
from b we have that x=-1/2 so statement never holds (combining both)
so I would say --c--

axefx Newbie | Next Rank: 10 Posts
Joined
01 Dec 2006
Posted:
9 messages
Wed Jan 17, 2007 12:56 pm
thankont wrote:
I am not sure here but from n^x 01
from b we have that x=-1/2 so statement never holds (combining both)
so I would say --c--
Would you mind explaining this:
"n^x 01 "

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