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Are positive integers p and q both greater than n ? [#permalink]
 14 Jul 2010, 13:40
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Are positive integers p and q both greater than n
(1) p-q is greater than n
(2) q>p
Last edited by Bunuel on 20 Mar 2012, 23:20, edited 1 time in total.
Edited the question and added the OA
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Re: p and q greater than n [#permalink]
14 Jul 2010, 15:06
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Re: DS: positive integers p and q [#permalink]
17 Feb 2011, 06:59
(i) Clearly, not sufficient;
(ii) Clearly, not sufficient.
Taken together:
We can subtract two inequalities with different signs:
p-q > n -----p > n+q
q > p -------p < q
Subtract and get 0 > n
Since n is less than zero and p and q are positive integers, then obviously n < p or q
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Are p and q both greater than n? [#permalink]
21 Feb 2011, 23:13
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Are p and q both greater than n? (1) p - q is greater than n (2) q>p EDIT: p and q are positive integers.... I missed that part  Sorry!
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Last edited by Entwistle on 22 Feb 2011, 01:00, edited 1 time in total.
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Re: Are p and q both greater than n? [#permalink]
22 Feb 2011, 00:46
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Are you sure the correct answer is C?
Let's do two cases for which the stated conditions hold.
Case 1: p= 2, q=3
From condition 1 it follows that n < -1, i.e. n is smaller than both p and q.
Case 2: p=-3, q=-2
From condition 1 it follows that n <-1, i.e. it is unclear whether n is smaller or larger than p and q.
Unless the question states that p and q are positive (integers) I think the correct solution is E (not C).
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Re: Are p and q both greater than n? [#permalink]
22 Feb 2011, 00:59
stanford2012 wrote: Are you sure the correct answer is C?
Let's do two cases for which the stated conditions hold.
Case 1: p= 2, q=3
From condition 1 it follows that n < -1, i.e. n is smaller than both p and q.
Case 2: p=-3, q=-2
From condition 1 it follows that n <-1, i.e. it is unclear whether n is smaller or larger than p and q.
Unless the question states that p and q are positive (integers) I think the correct solution is E (not C). I'm uploading the screenshot 
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Re: Are p and q both greater than n? [#permalink]
22 Feb 2011, 01:03
stanford2012 wrote: Are you sure the correct answer is C?
Let's do two cases for which the stated conditions hold.
Case 1: p= 2, q=3
From condition 1 it follows that n < -1, i.e. n is smaller than both p and q.
Case 2: p=-3, q=-2
From condition 1 it follows that n <-1, i.e. it is unclear whether n is smaller or larger than p and q.
Unless the question states that p and q are positive (integers) I think the correct solution is E (not C). Gotcha man Thanks!
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Re: Are p and q both greater than n? [#permalink]
22 Feb 2011, 02:06
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Re: Are p and q both greater than n? [#permalink]
22 Feb 2011, 07:15
Bunuel wrote: Merging similar topics. Entwistle wrote: Are p and q both greater than n?(1) p - q is greater than n (2) q>p EDIT: p and q are positive integers.... I missed that part Sorry! Entwistle you should type the question EXACTLY as it's given in the source. I'm sorry about that man Wont happen in the future!
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Re: p and q greater than n [#permalink]
22 Feb 2011, 08:25
Bunuel wrote: zisis wrote: are positive integers p and q both greater than n
(1) p-q is greater than n
(2) q>p Given: p=integer>0 and q=integer>0. Question: is p>n and q>n? (1) p-q>n. Clearly insufficient. (2) q>p, no info about n. Not sufficient. (1)+(2) Sum (1) and (2) (we can safely do this as their signs are in the same direction): p-q+q>n+p --> n<0. As given that both p and q are positive then they are greater than negative n. Sufficient. Answer: C. Your approach is too good
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Re: p and q greater than n [#permalink]
22 Feb 2011, 09:07
(1) is not sufficient, as p is greater but we don't know about q
(2) this statement doesn't relate p and q with n, so it is insufficient as well.
With both statements together, we know that n is negative.
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Re: p and q greater than n [#permalink]
23 Feb 2011, 13:11
Baten80 wrote: Bunuel wrote: zisis wrote: are positive integers p and q both greater than n
(1) p-q is greater than n
(2) q>p Given: p=integer>0 and q=integer>0. Question: is p>n and q>n? (1) p-q>n. Clearly insufficient. (2) q>p, no info about n. Not sufficient. (1)+(2) Sum (1) and (2) (we can safely do this as their signs are in the same direction): p-q+q>n+p --> n<0. As given that both p and q are positive then they are greater than negative n. Sufficient. Answer: C. Your approach is too good I second that! In my attempt to solve it i did a whole bunch of things but this was the easiest!
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Re: p and q greater than n [#permalink]
23 Feb 2011, 18:42
From 1) p-q is greater than n => p-n > q (a +ve value) so p > n, but nothing can be inferred about q, so (1) is not sufficient. From (2) q > p but nothing is given about n, so (2) is not sufficient. So combining (1) and (2) we can see that q > p > n. Answer is C.
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Re: p and q greater than n [#permalink]
11 Mar 2011, 04:36
subhashghosh wrote: From 1) p-q is greater than n
=> p-n > q (a +ve value) so p > n, but nothing can be inferred about q, so (1) is not sufficient.
From (2) q > p but nothing is given about n, so (2) is not sufficient.
So combining (1) and (2) we can see that q > p > n.
Answer is C. I like this different approach!!
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Gmatprep DS Questions 3 [#permalink]
20 Mar 2012, 17:45
Another one... many thanks, V.
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Re: Gmatprep DS Questions 3 [#permalink]
20 Mar 2012, 18:35
1. A is insufficient because we know p-q>n. This means p>n but q need not be greater than n. We have no further information on q. e.g. 5-2 > 2 but here q = n. So, rule out A.
2. B is insufficient as no information is given on n. So, we can't compare n to p and q.
Together C: we know that q-p MUST be negative and that makes n negative. Since p and q are positive integers its sufficient to answer the question that BOTH p and Q are greater than n.
I suppose the mistake you made is that you didn't read the key word POSITIVE INTEGERS.
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Re: Gmatprep DS Questions 3 [#permalink]
20 Mar 2012, 23:22
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Re: Gmatprep DS Questions 3
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20 Mar 2012, 23:22
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