Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 04 May 2015, 03:51

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# What is the value of Z? 1) z^2 =49 2) z< 1/z

Author Message
TAGS:
Director
Joined: 17 Oct 2005
Posts: 940
Followers: 1

Kudos [?]: 62 [0], given: 0

What is the value of Z? 1) z^2 =49 2) z< 1/z [#permalink]  15 Nov 2005, 19:55
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
What is the value of Z?

1) z^2 =49

2) z< 1/z
Manager
Joined: 19 Sep 2005
Posts: 110
Followers: 1

Kudos [?]: 3 [0], given: 0

I believe it's C
z^2< 49
ok, that tells me that z is positive or negative 7, insufficient

z < 1/z

the only way this would happen is if z is a fraction or z is a negative number....but it could be any of the numbers that fit this criteria, insufficient

Both Combined works- -7 is the only number that meets both critieria...think of a number line....-7 is way lower (further to the left than -1/7 is)
Intern
Joined: 01 Jun 2005
Posts: 40
Followers: 0

Kudos [?]: 0 [0], given: 0

stmt 1) z = +/- 7 not suff
stmt 2) 1/z > z is possible if z is any proper fraction or if z is any negative integer less than -1. Not suff

1) & 2) we get -7 --> only number for which 1 and 2 holds

C it is
Current Student
Joined: 29 Jan 2005
Posts: 5244
Followers: 23

Kudos [?]: 179 [0], given: 0

-7 is less than -1/7.

Director
Joined: 27 Jun 2005
Posts: 515
Location: MS
Followers: 2

Kudos [?]: 28 [0], given: 0

E

What is the value of Z?

1) z^2 =49

z = 7 or -7 Insuff

2) z< 1/z

there are lots of values which statisfy this so Insuff

taking together ....proves that 49<1 wrong ....

hence E
Current Student
Joined: 28 Dec 2004
Posts: 3391
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 181 [0], given: 2

this is another 200 level question..that kaplan sells as a 600+...LOL...

it should be C...
VP
Joined: 22 Aug 2005
Posts: 1123
Location: CA
Followers: 1

Kudos [?]: 43 [0], given: 0

cool_jonny009 wrote:
E

What is the value of Z?

1) z^2 =49

z = 7 or -7 Insuff

2) z< 1/z

there are lots of values which statisfy this so Insuff

taking together ....proves that 49<1 wrong ....

hence E

if z < 1/z we cannot say z^2 < 1, what id z is -ve?
_________________

Whether you think you can or think you can't. You're right! - Henry Ford (1863 - 1947)

Director
Joined: 27 Jun 2005
Posts: 515
Location: MS
Followers: 2

Kudos [?]: 28 [0], given: 0

Quote:

thanx duttsit .....for pointing out my wrong assumption ..
Appreciate it
Similar topics Replies Last post
Similar
Topics:
does z = 8? (1) z = 2 or z = 8 (2) z = 3 or z = 8 e (1) z = 8 23 Oct 2009, 05:11
7 If Z_1 , Z_2 , Z_3 , ..., Z_n is a sequence of consecutive 22 07 Jul 2009, 09:55
z is not equal to 0, is z^2/ < 1? =absolute value 1) z 1 11 Dec 2007, 10:55
If z1 + z2 + z3 + .....+ zN is a series of consecutive 8 25 Nov 2007, 02:38
is 1+z +z^2+z^3+z^4> 1/(1-z)? I) z>0 II) Z<1 9 20 Feb 2006, 17:39
Display posts from previous: Sort by