|
Author |
Message |
|
TAGS:
|
|
|
Senior Manager
Joined: 11 May 2004
Posts: 462
Location: New York
Followers: 1
Kudos [?]:
3
[0], given: 0
|
If n = 4p, where p is a prime number greater than 2, how [#permalink]
 10 Dec 2005, 20:30
If n = 4p, where p is a prime number greater than 2, how many different positive even divisors does n have, including n?
a. 2
b. 3
c. 4
d. 6
e. 8
|
|
|
|
|
|
|
Senior Manager
Joined: 11 May 2004
Posts: 462
Location: New York
Followers: 1
Kudos [?]:
3
[0], given: 0
|
My working:
Let p = 3
4(3) =12
Divisors of 12 = 1, 12, 2, 6, 3, 4
Even divisors = 12, 2, 6, 4
Try 5
4(5) = 20
Divisors = 1, 20, 2, 10, 4, 5
Even = 20, 2, 10, 4
I would select 4, choice C, but that is not the answer.
Anyone see my mistake?
|
|
|
|
|
|
SVP
Joined: 24 Sep 2005
Posts: 1913
Followers: 6
Kudos [?]:
55
[0], given: 0
|
nothing wrong with your reasoning 
|
|
|
|
|
|
VP
Joined: 06 Jun 2004
Posts: 1068
Location: CA
Followers: 2
Kudos [?]:
12
[0], given: 0
|
4 seems like the correct answer..unless its asking for total positive factors only 
|
|
|
|
|
|
Current Student
Joined: 29 Jan 2005
Posts: 5289
Followers: 17
Kudos [?]:
90
[0], given: 0
|
I get 4, or (C) as well.
|
|
|
|
|
|
Senior Manager
Joined: 11 May 2004
Posts: 462
Location: New York
Followers: 1
Kudos [?]:
3
[0], given: 0
|
The OA said 3, must be a mistake. 
|
|
|
|
|
|
VP
Joined: 20 Sep 2005
Posts: 1023
Followers: 3
Kudos [?]:
23
[0], given: 0
|
4 is the answer.
BTW, the OA in the 11th edition is indeed 4.
|
|
|
|
|
|
CEO
Joined: 20 Nov 2005
Posts: 2934
Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008
Followers: 7
Kudos [?]:
37
[0], given: 0
|
I would suggest not using the real numbers for such questions.
Factors will be 1,n,p,2,4 and 2p. Among these positive odd numbers are n,2,4 and 2p.
Hence answer is 4.
_________________
SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Similar topics |
Author |
Replies |
Last post |
|
Similar
Topics:
|
 |
|
|
If n = 4p, where p is a prime number greater than 2 how many
|
Priti |
8 |
14 Aug 2005, 13:43 |
|
|
|
|
If n=4p, where p is a prime number greater than2, how many
|
iamba |
3 |
24 Jun 2007, 21:21 |
|
|
|
|
If n=4p, where p is a prime number greater than 2. How many
|
empanado |
1 |
30 Jun 2007, 20:29 |
|
|
8
|
|
If n=4p where p is a prime number greater than 2, how many
|
tinman1412 |
7 |
24 Aug 2007, 09:41 |
 |
6
|
 |
If n=4p, where p is a prime number greater than 2, how many
|
blog |
18 |
23 Jan 2008, 12:07 |
|
|
|
|
|
|
close
