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Re: DS: Kaptest# 1 [#permalink]
04 Jun 2005, 17:35

Vithal wrote:

Does p^2 = q if p is a prime number? (1) q^2 - P^2 = 0 (2) P^2 = 49

i do not think it is so easy. anyway, let me try this way:

from i, q^2 - P^2 = 0,
q^2 = P^2.
so, q = + or - p.
if p = 0 or 1, the answer is yes, otherwise not. but the question says that p is a prime number. so q = +p. so sifficient.

from ii, it says only about the value of p which is 7. we do not have any relationship bet p and q. so it is insufficient to tell something about p and q.

Re: DS: Kaptest# 1 [#permalink]
05 Jun 2005, 11:44

Vithal wrote:

Does p^2 = q if p is a prime number? (1) q^2 - P^2 = 0 (2) P^2 = 49

A

as a tells you that tha q^2 = p^2 and the only possibility of that being true while p^2=q is if they were both 1. Since we know this is not the case, the statement 'p^2=q' is always false.

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