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Is x an integer?

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GMAT 1: 710 Q50 V36
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Is x an integer?  [#permalink]

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New post 08 Sep 2012, 06:01
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A
B
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D
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  45% (medium)

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56% (00:55) correct 44% (01:02) wrong based on 300 sessions

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Is x an integer?

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

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

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New post 08 Sep 2012, 06:17
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Re: Is x an integer?  [#permalink]

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New post 08 Sep 2012, 06:29
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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] 18 Dec 2017, 14:27
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