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OG question 11th ed

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OG question 11th ed

by preciousrain7 » Fri Apr 11, 2008 12:23 pm
Is n an integer?

1. n^2 is an integer
2. sqrt(n) is an integer

Thanks in advance for your help
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by tmmyc » Fri Apr 11, 2008 5:12 pm
Statement 1:

n^2 = 4
n = 2
YES

n^2 = 5
n = sqrt(5)
NO

Insufficient.

Statement 2:
Sufficient since any integer squared is also an integer.

Example
sqrt(n) = 2
n = 4
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by hillzheng » Wed Apr 16, 2008 11:38 pm
the answer is B
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by preciousrain7 » Sat Apr 19, 2008 11:07 am
tmmyc wrote:Statement 1:

n^2 = 4
n = 2
YES

n^2 = 5
n = sqrt(5)
NO

Insufficient.

Statement 2:
Sufficient since any integer squared is also an integer.

Example
sqrt(n) = 2
n = 4
Ahhh.... I made the mistake of thinking if you sq any # it'll be an integer. Thanks a bunch!
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