Is x an integer? : GMAT Data Sufficiency (DS)
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Is x an integer?

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08 Sep 2012, 05:01
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Is x an integer?

(1) x³ is an integer
(2) ∛(x) is an integer

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Can somebody explain why A is not sufficient?
[Reveal] Spoiler: OA
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Re: Is x an integer? [#permalink]

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08 Sep 2012, 05:17
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Is x an integer?

(1) x³ is an integer. If $$x=1$$, then the answer is YES but if $$x=\sqrt[3]{2}$$, then the answer is NO. no sufficient.

(2) ∛(x) is an integer --> $$\sqrt[3]{x}=integer$$ --> raise to the third power: $$x=integer^3=integer$$. Sufficient.

Hope it's clear.
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Manager
Joined: 03 Jul 2012
Posts: 139
GMAT 1: 710 Q50 V36
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WE: Programming (Computer Software)
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Kudos [?]: 92 [1] , given: 16

Re: Is x an integer? [#permalink]

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08 Sep 2012, 05:29
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Bunuel wrote:
Is x an integer?

(1) x³ is an integer. If $$x=1$$, then the answer is YES but if $$x=\sqrt[3]{2}$$, then the answer is NO. no sufficient.

(2) ∛(x) is an integer --> $$\sqrt[3]{x}=integer$$ --> raise to the third power: $$x=integer^3=integer$$. Sufficient.

Hope it's clear.

Yeah, its very clear . Thanks Bunuel.
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Re: Is x an integer? [#permalink]

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15 Jul 2014, 04:48
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Re: Is x an integer? [#permalink]

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26 Feb 2016, 00:30
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
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Re: Is x an integer?   [#permalink] 26 Feb 2016, 00:30
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