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If n is an integer and not prime number, then n must be

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chunjuwu
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If n is an integer and not prime number, then n must be [#permalink] New post   10 Sep 2004, 06:48
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A
B
C
D
E

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If n is an integer and not prime number, then n must be

(A)the total of three prime numbers

(B)the difference between two even numbers

(C) the difference between one even number and one odd number

(D)the product of one even number and one odd number

(E)the product of prime numbers



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Re: If n is an integer and not prime number, then n must be [#permalink] New post   10 Sep 2004, 07:40
I am getting C as the answer by POE.

Let us assume the number 1, 4, 6 ,8 and 9.

A - ruled out because 6 = 1+2+3 where 1 is not prime.
B - 1= 9-8 but 9 is not even
D - 32 = 8*4 where both are even
E - 1 = 1*1 but 1 is not prime.

However I could not unprove C and thus is the choice. Do correct me if I am wrong.

8-) 8-)
chunjuwu wrote:
If n is an integer and not prime number, then n must be

(A)the total of three prime numbers

(B)the difference between two even numbers

(C) the difference between one even number and one odd number

(D)the product of one even number and one odd number

(E)the product of prime numbers
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twixt
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Re: If n is an integer and not prime number, then n must be [#permalink] New post   10 Sep 2004, 07:40
I choose E

By the way I have a problem with this question as all prime are > 0 when statement about n does not avoid n<0...
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Re: If n is an integer and not prime number, then n must be [#permalink] New post   10 Sep 2004, 07:43
However, as the question stem talks about prime numbers, I assumed that all the numbers are positive. Not sure whether I am right.
Looks ambiguous 8-) 8-)

twixt wrote:
I choose E

By the way I have a problem with this question as all prime are > 0 when statement about n does not avoid n<0...
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Re: If n is an integer and not prime number, then n must be [#permalink] New post   10 Sep 2004, 07:45
Dear all,

the OA indeed is E

but a little weird, becuase how to think about 1 in choice E?
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twixt
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Re: If n is an integer and not prime number, then n must be [#permalink] New post   10 Sep 2004, 07:54
Really weird 1 is not taken into account as well as negative numbers...

Is it an official one ?
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Re: If n is an integer and not prime number, then n must be [#permalink] New post   10 Sep 2004, 08:12
Hello, twixt

I think when we talk about prime factor, we need not consider negative numbers.

How do you think about ?
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Re: If n is an integer and not prime number, then n must be [#permalink] New post   10 Sep 2004, 08:41
I have chosen E too.

Simply because the other options are not true.
E is strange, but I am 100% sure the other options are not possible.
I used trial and error.

Regards,

Alex



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Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
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Thank you for understanding, and happy exploring!
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Re: If n is an integer and not prime number, then n must be [#permalink]
10 Sep 2004, 08:41
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