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anuramm
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N/858 is a prime number , N = ?. A: N<5000 B: N has prime 07 Sep 2004, 04:47
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N/858 is a prime number , N = ?.
A: N<5000
B: N has prime multiples different from the prime multiples of 858.

Please explain.
Thanks.



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N/858 is a prime number , N = ?. A: N<5000 B: N has prime 07 Sep 2004, 05:06
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anuramm
N/858 is a prime number , N = ?.
A: N<5000
B: N has prime multiples different from the prime multiples of 858.

Please explain.
Thanks.
Show more


I go for C

my explanation:

858 = 2*3*11*13
So for N/858 to be a prime
possible values of N are-858*2, 858*3, 858*5, 858*7, etc

A-> N<5000. So N can be 858*2, 858*3 or 858*5 - Insufficient

B-> Insufficient

C-> N=858*5 (as 2 and 3 are already multiples of 858)

am not sure if this logic is correct. what do others think?
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N/858 is a prime number , N = ?. A: N<5000 B: N has prime 07 Sep 2004, 11:34
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hey stuti

u r right
it has to be 858 * 5 (C)
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Alex_NL
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N/858 is a prime number , N = ?. A: N<5000 B: N has prime 07 Sep 2004, 11:46
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I agree with stuti his explanation.
I had the same approach.

But, maybe I am not getting it right. If 858 * 5 will be the answer, we can factor 858 again and we get the same primes as in 858.

On the real test I would give C as answer.

Regards,

Alex
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N/858 is a prime number , N = ?. A: N<5000 B: N has prime 07 Sep 2004, 12:00
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stuti,
In your explanation
C-> N=858*5 (as 2 and 3 are already multiples of 858)
here 2 and 3 are prime factors of 858 .

Is prime factor and prime multiple one and the same.
What does prime multiple mean.
I dont understand this question.

Thanks.
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N/858 is a prime number , N = ?. A: N<5000 B: N has prime 07 Sep 2004, 20:15
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anuramm
stuti,
In your explanation
C-> N=858*5 (as 2 and 3 are already multiples of 858)
here 2 and 3 are prime factors of 858 .

Is prime factor and prime multiple one and the same.
What does prime multiple mean.
I dont understand this question.

Thanks.
Show more


I had the same doubt. What I figure is that if N/858 is to be an integer, it will definitely have the prime factors of 858 - so in this context, I interpreted B to mean different prime factors, which incidently will lead to different prime multiples[5*2, 5*3]

I am not sure if this interpretation is correct. What do others say?



Archived Topic
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 Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
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