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Is PQ > 1?

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Manager
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Joined: 27 Apr 2012
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Is PQ > 1? [#permalink] New post 05 Nov 2012, 00:13
1
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A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

69% (01:54) correct 31% (00:37) wrong based on 16 sessions
Is PQ > 1?

(1) P^Q = 1
(2) Q = -1
[Reveal] Spoiler: OA
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Re: Is PQ > 1? [#permalink] New post 05 Nov 2012, 00:25
shivanigs wrote:
Hi,

Request help with the following question.Thanks..

Is PQ > 1?

1.P^q = 1
2.q = -1


Statement 1: p^q =1
=> p could be any number and q=0
or q could be any number and p=1
or q coule be any even number and p=-1


Clearly not sufficient as PQ could be 0, >1 or <1.

Statement 2: q=-1
Clearly insufficient, no information on p.

Combining statement 1 and 2: if q=-1 and p^q =1
this gives p = 1, q=-1. Sufficient. (We can answer whether pq>1 or not)

Hence Ans C it is.
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Re: Is PQ > 1? [#permalink] New post 05 Nov 2012, 00:40
look at your possibilities step by step:

1/ p^q=1
means
either q=0 and/or p=1
p=545, q=0 => pq<1 or
p=1, q=8 => pq>1
insufficient

2/ we know nothing about p
example p=100 then pq<1
p=-100 then pq>1
insufficient

1/+2/
if q=-1 then p must be equal to 0 to satisfy the condition of 1/
sufficient
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Re: Is PQ > 1? [#permalink] New post 05 Nov 2012, 00:52
Hi,

Consider, 1. p^q=1
If p=10, q=0, then
=> p^q=1 (10^0=1)
=> pq > 1 is false (10*0 = 0 < 1)

If p=-1, q=-2, then
=> p^q=1 (-1^-2=1)
=> p^q > 1 true (-1*-2 = 2 > 1)

We have both true and false considering only first condition. Hence, A and D choices are eliminated.

-------------------

Now, consider 2. q=-1
If p=-2, then p^q>1
If p=2, then p^q<1
So, clearly only 2 is insufficient. Hence, B is eliminated.

-------------------

If p^q=1 and q=-1, then p=1.
Since p and q have definite values, 1. and 2. together are sufficient.

Hence, C is the answer.
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Re: Is PQ > 1? [#permalink] New post 05 Nov 2012, 04:02
shivanigs wrote:
Hi,

Request help with the following question.Thanks..

Is PQ > 1?

1.P^q = 1
2.q = -1



1. If P^Q = 1 then P = 1 or Q = 0. consider p = 2 then Q has to be 0. P = 1 then Q can be anything. not suff.
2. Q= -1 then P and can be possibtive and PQ<1 or P can be negative ans PO>1. hence not suff.

combining 1 and 2.

if Q= -1 then P has to be 1 hence PQ <1 suff. answer should be C
_________________

-------Analyze why option A in SC wrong-------

Re: Is PQ > 1?   [#permalink] 05 Nov 2012, 04:02
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