It is currently 20 Oct 2017, 22:14

### 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

# Is z + z < z? 1. -4z > 4z 2. z^3 < z^2

Author Message
CEO
Joined: 21 Jan 2007
Posts: 2734

Kudos [?]: 1049 [0], given: 4

Location: New York City
Is z + z < z? 1. -4z > 4z 2. z^3 < z^2 [#permalink]

### Show Tags

25 Nov 2007, 02:27
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Is z + z < z?

1. -4z > 4z
2. z^3 < z^2

Kudos [?]: 1049 [0], given: 4

Intern
Joined: 23 Sep 2007
Posts: 35

Kudos [?]: 4 [0], given: 0

### Show Tags

03 Dec 2007, 11:05
I agree A.

A is sufficient

for -4Z > 4Z , Z has to be negative. And only if Z is -ve will Z+Z<Z

B is not sufficient

AS +ve franctions like 1/2^3 < 1/2^2

Kudos [?]: 4 [0], given: 0

Senior Manager
Joined: 09 Oct 2007
Posts: 463

Kudos [?]: 54 [0], given: 1

### Show Tags

03 Dec 2007, 11:05
D. Only way a higher power is less is when the base is negative.

Kudos [?]: 54 [0], given: 1

CEO
Joined: 21 Jan 2007
Posts: 2734

Kudos [?]: 1049 [0], given: 4

Location: New York City

### Show Tags

03 Dec 2007, 11:09
asdert wrote:
D. Only way a higher power is less is when the base is negative.

or when the base is a fraction!

OA is A

Kudos [?]: 1049 [0], given: 4

Senior Manager
Joined: 09 Oct 2007
Posts: 463

Kudos [?]: 54 [0], given: 1

### Show Tags

03 Dec 2007, 12:07
makes sense.

Also, sometimes I get confused in problems where we need to replace a variable for a value.

Let's say z = -2

Then z + z < z = -2 +(-2) = -2 correct? and,
-4z = -4(-2), thus making it pos. Right?

But never:
-4(2)

I don't know why this keeps bothering me. thanks.

Kudos [?]: 54 [0], given: 1

03 Dec 2007, 12:07
Display posts from previous: Sort by