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Does P^2 = Q if P is a prime number? (1) Q^2 - P^2 = 0 (2)

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VP
Joined: 22 Oct 2006
Posts: 1437

Kudos [?]: 195 [0], given: 12

Schools: Chicago Booth '11
Does P^2 = Q if P is a prime number? (1) Q^2 - P^2 = 0 (2) [#permalink]

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12 Mar 2008, 08:59
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Does P^2 = Q if P is a prime number?

(1) Q^2 - P^2 = 0
(2) P^2 = 49

Kudos [?]: 195 [0], given: 12

CEO
Joined: 17 Nov 2007
Posts: 3585

Kudos [?]: 4473 [0], given: 360

Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Re: DS - Prime Number [#permalink]

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12 Mar 2008, 09:38
A

1. $$P^2 = Q^2$$ and $$P^2=Q$$. It is possible only if Q=1,0 and P=+/-1,0. But -1,0,1 is not a prime number. Therefore, 1 is sufficient: $$P^2 <> Q$$

2. nothing about Q (Q may be 49 or 50, for example). insufficient
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Kudos [?]: 4473 [0], given: 360

Re: DS - Prime Number   [#permalink] 12 Mar 2008, 09:38
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