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Is x an integer?

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Is x an integer? [#permalink] New post 08 Sep 2012, 05:01
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  45% (medium)

Question Stats:

53% (01:40) correct 47% (00:53) wrong based on 103 sessions
Is x an integer?

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

[Reveal] Spoiler:
Can somebody explain why A is not sufficient?
[Reveal] Spoiler: OA
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Re: Is x an integer? [#permalink] New post 08 Sep 2012, 05:17
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Re: Is x an integer? [#permalink] New post 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.

Answer: B.

Hope it's clear.

Yeah, its very clear . Thanks Bunuel. :)
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Re: Is x an integer? [#permalink] New post 15 Jul 2014, 04:48
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Re: Is x an integer?   [#permalink] 15 Jul 2014, 04:48
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