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# if n is an integer, is -3x^n positive

Author Message
Intern
Joined: 28 Mar 2017
Posts: 9
GMAT 1: 550 Q43 V23
if n is an integer, is -3x^n positive  [#permalink]

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13 May 2018, 12:43
00:00

Difficulty:

55% (hard)

Question Stats:

27% (00:16) correct 73% (00:38) wrong based on 15 sessions

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if n is an integer, is (-3x)^n positive?
1) x is negative
2) n is odd
Intern
Joined: 28 Mar 2017
Posts: 9
GMAT 1: 550 Q43 V23
Re: if n is an integer, is -3x^n positive  [#permalink]

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13 May 2018, 12:46
if n is an integer, is (-3x)^n positive?
1) x is negative
2) n is odd

Hi Bunuel and others
Please help me with the above problem......I am getting the ans as A...as -3*x will always be positive and whether n is positive or negative, the given expression will always be positive.. B in itself is insufficient....
Senior Manager
Joined: 29 Dec 2017
Posts: 386
Location: United States
Concentration: Marketing, Technology
GMAT 1: 630 Q44 V33
GMAT 2: 690 Q47 V37
GMAT 3: 710 Q50 V37
GPA: 3.25
WE: Marketing (Telecommunications)
if n is an integer, is -3x^n positive  [#permalink]

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13 May 2018, 17:11
1

Hi Bunuel and others
Please help me with the above problem......I am getting the ans as A...as -3*x will always be positive and whether n is positive or negative, the given expression will always be positive.. B in itself is insufficient....

You do everything right. The author/you of the topic made a mistake, it supposed to be -3*(x)^n. Then the answer is indeed (C)

Here is the original question:
https://gmatclub.com/forum/if-n-is-an-i ... 11752.html
if n is an integer, is -3x^n positive &nbs [#permalink] 13 May 2018, 17:11
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