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can anyone help me with the explanation to this problem.
The wording makes this question harder than it is actually.
If positive integer p cannot be expressed as the product of two integers >1, it simply means that p is a prime number. So, basically question asks is p prime?
(1) 31<p<37 --> between these numbers there is no prime. Hence ANY integer from these range CAN be expresses as the product of two numbers. Sufficient.
(2) p is odd --> odd numbers can be primes as well as non-primes. Not sufficient.
Re: Positive integer problem [#permalink]
25 Aug 2011, 12:38
Bunuel,
This question confuses me big time. When I saw "CAN" I expected as sufficient to be able to prove that yes, there was a way to do so. Hence for statement (2) I'd say that yes, IT CAN BE EXPRESSED AS THE PRODUCT OF TWO INTEGERS. Do you consider the following two statements to have the same meaning?
(i) Can the positive integer p be expressed as the product of two integers, each of which is greater than 1?
(ii) Is the positive integer p the product of two integers, each of which is greater than 1?
can anyone help me with the explanation to this problem.
The wording makes this question harder than it is actually.
If positive integer p can not be expressed as the product of two integers >1, it simply means that p is a prime number. So, basically question asks is p prime?
(1) 31<p<37 --> between these numbers there is no prime. Hence ANY integer from these range CAN be expresses as the product of two numbers. Sufficient.
(2) p is odd --> odd numbers can be primes as well as non-primes. Not sufficient.
Answer: A.
If positive integer p can not be expressed as the product of two integers >1, it simply means that p is a prime number. So, basically question asks is p prime? how can u say this..please elaborate...how p is prime...any no greater than one can be any no..why r u sayin p is prime?
Re: Positive integer problem [#permalink]
16 Sep 2011, 10:26
ruturaj wrote:
If positive integer p can not be expressed as the product of two integers >1, it simply means that p is a prime number. So, basically question asks is p prime? how can u say this..please elaborate...how p is prime...any no greater than one can be any no..why r u sayin p is prime?
Prime number can only be expressed as "1*p", where p is the prime number itself
13=1*13
Can we write any prime number in the form; p=m*n where, p=prime number m=integer greater than 1 n=integer greater than 1 No, right? For prime number, at least one of m and n must be 1.
Thus, question is indirectly asking whether p is a prime number. _________________
Re: Can the positive integer p be expressed as the product of [#permalink]
23 Feb 2012, 20:08
I don't understand this question. I am getting E.
Can the positive integer p be expressed as the product of two integers, each of which is greater than 1?
Statement (1) states that 31<p<37
My logic was that p can be anything that fits between 31 and 37, so 36 36 = 9 x 4 and each integer is greater than 1, so it is sufficient 36 = -9 x -4 and each integer is not greater than 1, so insufficient.
Statement (2), I agree it is insufficient.
(1) and (2) is still insufficient because 35 (fits statement 2) and 35 can be 7x5 so each integer is greater than 1. 35 can also be -7x-5 so each integer is not greater than 1.
Re: Can the positive integer p be expressed as the product of [#permalink]
24 Feb 2012, 00:25
Expert's post
chamisool wrote:
I don't understand this question. I am getting E.
Can the positive integer p be expressed as the product of two integers, each of which is greater than 1?
Statement (1) states that 31<p<37
My logic was that p can be anything that fits between 31 and 37, so 36 36 = 9 x 4 and each integer is greater than 1, so it is sufficient 36 = -9 x -4 and each integer is not greater than 1, so insufficient.
Statement (2), I agree it is insufficient.
(1) and (2) is still insufficient because 35 (fits statement 2) and 35 can be 7x5 so each integer is greater than 1. 35 can also be -7x-5 so each integer is not greater than 1.
Am I misunderstanding the question?
It seems that you misinterpreted the question.
Look at the definition of a prime number: a prime number is a positive integer with exactly two factors: 1 and itself. Now, the questions asks: "can the positive integer p be expressed as the product of two integers, each of which is greater than 1" So, the question basically asks whether p is a prime number, because if it is then p can NOT be expressed as the product of two integers, each of which is greater than 1.
(1) states: 31 < p < 37. Between these numbers there is no prime. Hence ANY integer from these range CAN be expresses as the product of two numbers, which means that the answer to the question is YES: p can always be expressed as the product of two integers, each of which is greater than 1. Sufficient.
Just to illustrate: 32=2*18, 33=3*11, 34=2*17, 35=5*7, 36=2*18.
Re: Can the positive integer P be expressed as a product of 2... [#permalink]
28 Feb 2012, 14:35
Expert's post
Merging similar topics.
vladkarz wrote:
Can the positive integer P be expressed as a product of two integers, each of which is greater than 1? (1) 31<p<37 (2) p=odd
The answer according my program is A, but I dont understand why it can not be D. Because if we take 3*3=9 which is odd and integer and greater than 1?
Thank you in advance
P is some particular integer and we are asked whether it can be expressed as a product of two integers, each of which is greater than 1. Now, for (2) if p=9 then the answer is YES, it can be expressed as a product of two integers, each of which is greater than 1 but of p=5 then the answer is NO, it cannot be expressed as a product of two integers, each of which is greater than 1. Two different answers, hence this statement is not sufficient.
Does it makes sense?
P.S. Please refer for a complete solution to the above posta and ask if anything remains unclear. _________________
Re: Can the positive integer P be expressed as a product of 2... [#permalink]
28 Feb 2012, 15:51
Bunuel wrote:
Merging similar topics.
vladkarz wrote:
Can the positive integer P be expressed as a product of two integers, each of which is greater than 1? (1) 31<p<37 (2) p=odd
The answer according my program is A, but I dont understand why it can not be D. Because if we take 3*3=9 which is odd and integer and greater than 1?
Thank you in advance
P is some particular integer and we are asked whether it can be expressed as a product of two integers, each of which is greater than 1. Now, for (2) if p=9 then the answer is YES, it can be expressed as a product of two integers, each of which is greater than 1 but of p=5 then the answer is NO, it cannot be expressed as a product of two integers, each of which is greater than 1. Two different answers, hence this statement is not sufficient.
Does it makes sense?
P.S. Please refer for a complete solution to the above posta and ask if anything remains unclear.
Thank you very much Bunuel,
So basically if there are 2 possible answers (yes/no) it will always be insufficient?
Re: Can the positive integer P be expressed as a product of 2... [#permalink]
28 Feb 2012, 15:55
1
This post received KUDOS
Expert's post
vladkarz wrote:
Thank you very much Bunuel,
So basically if there are 2 possible answers (yes/no) it will always be insufficient?
It's a YES/NO DS question. In a Yes/No Data Sufficiency question, statement is sufficient if the answer is “always yes” or “always no” while a statement is insufficient if the answer is "sometimes yes" and "sometimes no". _________________
Re: Can the positive integer p be expressed as the product of [#permalink]
08 Apr 2012, 04:51
Expert's post
Bunuel wrote:
chamisool wrote:
I don't understand this question. I am getting E.
Can the positive integer p be expressed as the product of two integers, each of which is greater than 1?
Statement (1) states that 31<p<37
My logic was that p can be anything that fits between 31 and 37, so 36 36 = 9 x 4 and each integer is greater than 1, so it is sufficient 36 = -9 x -4 and each integer is not greater than 1, so insufficient.
Statement (2), I agree it is insufficient.
(1) and (2) is still insufficient because 35 (fits statement 2) and 35 can be 7x5 so each integer is greater than 1. 35 can also be -7x-5 so each integer is not greater than 1.
Am I misunderstanding the question?
It seems that you misinterpreted the question.
Look at the definition of a prime number: a prime number is a positive integer with exactly two factors: 1 and itself. Now, the questions asks: "can the positive integer p be expressed as the product of two integers, each of which is greater than 1" So, the question basically asks whether p is a prime number, because if it is then p can NOT be expressed as the product of two integers, each of which is greater than 1.
(1) states: 31 < p < 37. Between these numbers there is no prime. Hence ANY integer from these range CAN be expresses as the product of two numbers, which means that the answer to the question is YES: p can always be expressed as the product of two integers, each of which is greater than 1. Sufficient.
Just to illustrate: 32=2*18, 33=3*11, 34=2*17, 35=5*7, 36=2*18.
Hope it's clear.
I think as you said, the key to this problem are the words each of which is greater than one is correct ???
You think the problem can be solved even if you do not see this nuance ??
Re: Can the positive integer p be expressed as the product of [#permalink]
13 Apr 2013, 07:13
Ah...I struggled with this one at first as well
I originally got D because I thought the question was asking if we can have product of two numbers for p.
Key for me was reminding myself that this is as "Yes or No" question, which means that it's "always yes" or "always no." For some reason, I had interpreted "Can the positive..." as is there a single instance where it can be true.
1) 31 < p < 37... 32 = 8 x 4 33 = 11 x 3 34 = 2 x 17 35 = 5 x7 36= 6 x 6 sufficient
2) p is odd p = 5 p = 15 not sufficient
So, the answer is A because statement 2 is not ALWAYS sufficient
Re: Can the positive integer p be expressed as the product of [#permalink]
12 Sep 2013, 08:53
chamisool wrote:
I don't understand this question. I am getting E.
Can the positive integer p be expressed as the product of two integers, each of which is greater than 1?
Statement (1) states that 31<p<37
My logic was that p can be anything that fits between 31 and 37, so 36 36 = 9 x 4 and each integer is greater than 1, so it is sufficient 36 = -9 x -4 and each integer is not greater than 1, so insufficient.
Statement (2), I agree it is insufficient.
(1) and (2) is still insufficient because 35 (fits statement 2) and 35 can be 7x5 so each integer is greater than 1. 35 can also be -7x-5 so each integer is not greater than 1.
Am I misunderstanding the question?
Hi Bunuel, The question asks: can p be expressed as a product of two numbers greater than 1? If I prove that p can be expressed as a product of two numbers which are < 1 and can also be expressed as a product of two numbers > 1 then the statement A) / B) would become insufficient. Right?
Now, as quoted above, for statement A), I can express 36= 1*36, -1*-36,-9*-4..... so doesn't it mean that statement A) is insufficient?
If A) is sufficient to answer the question, is it because of the fact that the question asks "Can it be expressed as product of two numbers > 1" instead of "Is P a product of two numbers which are always greater than 1?"
Re: Can the positive integer p be expressed as the product of [#permalink]
12 Sep 2013, 10:18
Expert's post
SurabhiStar wrote:
chamisool wrote:
I don't understand this question. I am getting E.
Can the positive integer p be expressed as the product of two integers, each of which is greater than 1?
Statement (1) states that 31<p<37
My logic was that p can be anything that fits between 31 and 37, so 36 36 = 9 x 4 and each integer is greater than 1, so it is sufficient 36 = -9 x -4 and each integer is not greater than 1, so insufficient.
Statement (2), I agree it is insufficient.
(1) and (2) is still insufficient because 35 (fits statement 2) and 35 can be 7x5 so each integer is greater than 1. 35 can also be -7x-5 so each integer is not greater than 1.
Am I misunderstanding the question?
Hi Bunuel, The question asks: can p be expressed as a product of two numbers greater than 1? If I prove that p can be expressed as a product of two numbers which are < 1 and can also be expressed as a product of two numbers > 1 then the statement A) / B) would become insufficient. Right?
Now, as quoted above, for statement A), I can express 36= 1*36, -1*-36,-9*-4..... so doesn't it mean that statement A) is insufficient?
If A) is sufficient to answer the question, is it because of the fact that the question asks "Can it be expressed as product of two numbers > 1" instead of "Is P a product of two numbers which are always greater than 1?"
No, the red part is not correct.
The question asks "can p be expressed as the product of two integers, each of which is greater than 1".
If from a statement you get that EACH possible value of p can be expressed as the product of two integers, each of which is greater than 1, then the answer is YES, and the statement is sufficient.
If from a statement you get that NONE of the possible values of p can be expressed as the product of two integers, each of which is greater than 1, then the answer is NO, and the statement is sufficient too.
If from a statement you get that some possible values of p cannot but other possible values of p can be expressed as the product of two integers, each of which is greater than 1, then we'd have two answers to the question and the statement wouldn't be sufficient.
Re: Can the positive integer p be expressed as the product of [#permalink]
23 Sep 2013, 23:20
Expert's post
abhisheksharma wrote:
What if i say that P = 33 x 1.
So it implies that surely one of the integer is greater than 1 but other one is 1 itself ?
Mental block..!!!
33 also can be expressed as 3*11, so the answer to the question "can the positive integer P be expressed as a product of two integers, each of which is greater than 1?" is still YES. _________________
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