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how many prime numbers are integer multiples of 16 ? 1. 0 2.

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how many prime numbers are integer multiples of 16 ? 1. 0 2. [#permalink] New post 04 Feb 2008, 18:49
how many prime numbers are integer multiples of 16 ?

1. 0
2. 1
3. 2
4. 4
5. 6
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Re: prime numbers [#permalink] New post 04 Feb 2008, 22:17
blog wrote:
how many prime numbers are integer multiples of 16 ?

1. 0
2. 1
3. 2
4. 4
5. 6


not quit clear. guess one i.e: 2.
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Re: prime numbers [#permalink] New post 04 Feb 2008, 22:25
1 ->2 is the only prime multiple of 16 ( 1 is not a prime number)
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Re: prime numbers [#permalink] New post 04 Feb 2008, 23:47
blog wrote:
how many prime numbers are integer multiples of 16 ?

1. 0
2. 1
3. 2
4. 4
5. 6


(A) as question asks for multiples as opposed to factors
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Re: prime numbers [#permalink] New post 05 Feb 2008, 01:15
blog wrote:
how many prime numbers are integer multiples of 16 ?

1. 0
2. 1
3. 2
4. 4
5. 6


Ima say A, though im not really clear on this question.
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Re: prime numbers [#permalink] New post 05 Feb 2008, 07:36
Agree with Incognito1...A it seems

incognito1 wrote:
blog wrote:
how many prime numbers are integer multiples of 16 ?

1. 0
2. 1
3. 2
4. 4
5. 6


(A) as question asks for multiples as opposed to factors
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Re: prime numbers [#permalink] New post 05 Feb 2008, 10:33
GMATBLACKBELT wrote:
blog wrote:
how many prime numbers are integer multiples of 16 ?

1. 0
2. 1
3. 2
4. 4
5. 6


Ima say A, though im not really clear on this question.


yeah the answer is A i.e 0. but m not getting how ?
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Re: prime numbers [#permalink] New post 05 Feb 2008, 12:44
A- 0

Its like

16 * something integer = gives a prime number

eg. 16 * 1/8 = does give 2 but 1/8 is not integer.

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Re: prime numbers [#permalink] New post 06 Feb 2008, 09:23
incognito1 wrote:
blog wrote:
how many prime numbers are integer multiples of 16 ?

1. 0
2. 1
3. 2
4. 4
5. 6


(A) as question asks for multiples as opposed to factors


Agreed.

Remember....MORE MULTIPLES, FEWER FACTORS
This asks for multiples, so logically no prime numbers can be multiples of 16 (or else they wouldn't be prime)
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Re: prime numbers [#permalink] New post 06 Feb 2008, 09:54
Am I missing something here.

I thought (A) was too obvious.

How can it remain a prime number if it has 2 integer factors (with one 16)?

I am bit lost. Perhaps its a straightforward and simple questions.

Anyone with different answer and explanation
Re: prime numbers   [#permalink] 06 Feb 2008, 09:54
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how many prime numbers are integer multiples of 16 ? 1. 0 2.

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