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N is a positive integer and N<10,000, how many prime

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Senior Manager
Senior Manager
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Joined: 07 Nov 2004
Posts: 452

Kudos [?]: 130 [0], given: 0

N is a positive integer and N<10,000, how many prime [#permalink]

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New post 11 Jan 2005, 14:50
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

N is a positive integer and N<10,000, how many prime integers does N have?
1) N is a multiple of 30.
2) N is a multiple of 70.

Kudos [?]: 130 [0], given: 0

Director
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Joined: 03 Nov 2004
Posts: 848

Kudos [?]: 58 [0], given: 0

 [#permalink]

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New post 11 Jan 2005, 14:56
I will go with 'C'
From 1: N can be 30, 60, 90, ........210............300..........
From 2: N can be 70, 140, 210.......
Both put together we know that N can be 210, 420, 630...........
Based on this we can say that N can have 4 prime integers 2, 3, 5, & 7

Kudos [?]: 58 [0], given: 0

Director
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Kudos [?]: 949 [0], given: 22

Location: PA
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New post 11 Jan 2005, 15:16
i think the Q has a typo it means Prime factors i guess

then i will go with C too

Kudos [?]: 949 [0], given: 22

Senior Manager
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Kudos [?]: 130 [0], given: 0

 [#permalink]

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New post 11 Jan 2005, 15:50
rthothad wrote:
I will go with 'C'
From 1: N can be 30, 60, 90, ........210............300..........
From 2: N can be 70, 140, 210.......
Both put together we know that N can be 210, 420, 630...........
Based on this we can say that N can have 4 prime integers 2, 3, 5, & 7


there is not OA but I will choose E.

If 210 * 11 = 2310 < 10000 and are mutiple of 30 and 70, but have 5 prime integers.

Kudos [?]: 130 [0], given: 0

VP
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Kudos [?]: 130 [0], given: 0

 [#permalink]

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New post 12 Jan 2005, 23:30
rthothad wrote:
I will go with 'C'
From 1: N can be 30, 60, 90, ........210............300..........
From 2: N can be 70, 140, 210.......
Both put together we know that N can be 210, 420, 630...........
Based on this we can say that N can have 4 prime integers 2, 3, 5, & 7


Agree with rthothad. OA is C.

Kudos [?]: 130 [0], given: 0

Intern
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Joined: 06 Dec 2004
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Kudos [?]: 1 [0], given: 0

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hard one from real test [#permalink]

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New post 13 Jan 2005, 12:54
Can you please elaborate why you have picked C

For me E is the answer

As DLMD pointed the prime factor can be either 4 or 5

- Joe

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hard one from real test   [#permalink] 13 Jan 2005, 12:54
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