Is n an integer ? (1) n^2 is an integer. (2) n^ 1/2 is an : DS Archive
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# Is n an integer ? (1) n^2 is an integer. (2) n^ 1/2 is an

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VP
Joined: 03 Apr 2007
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Is n an integer ? (1) n^2 is an integer. (2) n^ 1/2 is an [#permalink]

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17 May 2008, 07:24
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DS problems with square and square root always stump me. Please explain.
19. Is n an integer ?
(1) n^2 is an integer.
(2) n^ 1/2 is an integer.
Intern
Joined: 26 Apr 2008
Posts: 49
Followers: 1

Kudos [?]: 2 [0], given: 0

Re: DS- squareroot and square [#permalink]

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17 May 2008, 09:18
I think the ans is B.
square of any integer is an integer.

square root of an integer may be (100) or may not be (10) an integer.
Director
Joined: 23 Sep 2007
Posts: 789
Followers: 5

Kudos [?]: 184 [0], given: 0

Re: DS- squareroot and square [#permalink]

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17 May 2008, 09:59
Agree with B

statement 1: N^2 is an integer
if N^2 is 2, N is about 1.4
if N^2 is 1, N is 1
Insuff

statement 2: squareroot of N is an integer, therefore N must be and integer.
Suff
VP
Joined: 03 Apr 2007
Posts: 1367
Followers: 4

Kudos [?]: 593 [0], given: 10

Re: DS- squareroot and square [#permalink]

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18 May 2008, 06:11
gmatnub wrote:
Agree with B

statement 1: N^2 is an integer
if N^2 is 2, N is about 1.4
if N^2 is 1, N is 1
Insuff

statement 2: squareroot of N is an integer, therefore N must be and integer.
Suff

Thank you so much for the lucid explanation!
Re: DS- squareroot and square   [#permalink] 18 May 2008, 06:11
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