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Quant Review DS 107 Question?

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Quant Review DS 107 Question? [#permalink] New post 01 Jun 2011, 14:26
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Difficulty:

  45% (medium)

Question Stats:

69% (01:48) correct 31% (00:50) wrong based on 16 sessions
Can someone please help me understand this question.

I have a question about statement 2.....

If n is an integer between 2 and 100 and if n is also the square of an integer, what is the value of n?

1) n is even

2) The cube root of n is an integer




1) Not sufficient because n could be 4, 16, 36, 64, etc.

2) Doesn't between 2 and 100 mean 3 to 99? (I thought between means do not include the end points). Statement 2 says the cube of root n is an integer. Woudln't the cube root of 27 be included? as well as the cube root of 64?

The OG guide says there is only one such value of n between 2 and 100, which is 64.


Thanks for help in advance.
[Reveal] Spoiler: OA
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Re: Quant Review DS 107 Question? [#permalink] New post 01 Jun 2011, 15:06
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KraZZyiE wrote:
Can someone please help me understand this question.

I have a question about statement 2.....

If n is an integer between 2 and 100 and if n is also the square of an integer, what is the value of n?

1) n is even

2) The cube root of n is an integer




1) Not sufficient because n could be 4, 16, 36, 64, etc.

2) Doesn't between 2 and 100 mean 3 to 99? (I thought between means do not include the end points). Statement 2 says the cube of root n is an integer. Woudln't the cube root of 27 be included? as well as the cube root of 64?

The OG guide says there is only one such value of n between 2 and 100, which is 64.


Thanks for help in advance.


The question stem says that the "n" is square of an integer; 27 is not a square of any integer. Leaves us with just 64, which is 8^2.
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~fluke

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Re: Quant Review DS 107 Question? [#permalink] New post 01 Jun 2011, 15:49
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possibilities 4 9 16 25 36 49 64 81

1. Not sufficient

4 or 16 or 36....

2. Sufficient

as 64 is the only number is the above list thats also a cube of an integer.

Answer is B.
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Re: Quant Review DS 107 Question? [#permalink] New post 02 Jun 2011, 13:53
thanks. great explanation
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Re: Quant Review DS 107 Question? [#permalink] New post 16 Aug 2011, 04:49
thanks for the explanation
according to the quant review and the gmat club error log it is question #110 in the DS section, quant review
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Re: Quant Review DS 107 Question? [#permalink] New post 16 Aug 2011, 11:06
wow..i got it rite...B it is
Re: Quant Review DS 107 Question?   [#permalink] 16 Aug 2011, 11:06
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