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p a prime number

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anoo.anand
 Post subject: p a prime number
 Post Posted: Sun Sep 20, 2009 2:48 pm 
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Students


Posts: 73
Q>

Is the prime number p equal to 37 ?

1) p = n^2 + 1
2) p^2 is greater than 200.

question is to evaluate the second option , should we square and see all the prime numbers till say 100 ?

any shorter method ?
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nitin_prakash_khanna
 Post subject: Re: p a prime number
 Post Posted: Mon Sep 21, 2009 3:52 am 
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Students


Posts: 68
You dont need to.

St2 says p^2 > 200

Just to estimate you know p>15 becuase 15^2 = 225.
so p can be 17, 19, 23, ...37, .... And hence insufficent.

Assume you know the rest , Answer will E.
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RonPurewal
 Post subject: Re: p a prime number
 Post Posted: Sat Sep 26, 2009 3:09 am 
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ManhattanGMAT Staff


Posts: 7146
nicely done.

is this really a GMATPREP question? it doesn't seem like one.
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