Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 04 May 2015, 09:15

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# How many different positive integers are factors of 441?

Author Message
TAGS:
Senior Manager
Joined: 25 Nov 2006
Posts: 337
Schools: St Gallen, Cambridge, HEC Montreal
Followers: 2

Kudos [?]: 36 [0], given: 0

How many different positive integers are factors of 441?  [#permalink]  02 Mar 2008, 13:01
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions
How many different positive integers are factors of 441?

A- 4
B- 6
C- 7
D- 9
E- 11
Director
Joined: 05 Jan 2008
Posts: 707
Followers: 3

Kudos [?]: 146 [0], given: 0

Re: OG PS 209 [#permalink]  02 Mar 2008, 22:36
A-4

441 -> 21^2

21->1*3*7

441-> 1*3*7*21
_________________

Persistence+Patience+Persistence+Patience=G...O...A...L

Senior Manager
Joined: 25 Nov 2006
Posts: 337
Schools: St Gallen, Cambridge, HEC Montreal
Followers: 2

Kudos [?]: 36 [0], given: 0

Re: OG PS 209 [#permalink]  04 Mar 2008, 05:00
prasannar wrote:
A-4

441 -> 21^2

21->1*3*7

441-> 1*3*7*21

Good try, but not right answer.
There is also 9 or 63....

Is anyone able to explain?
VP
Joined: 22 Oct 2006
Posts: 1443
Schools: Chicago Booth '11
Followers: 8

Kudos [?]: 154 [1] , given: 12

Re: OG PS 209 [#permalink]  04 Mar 2008, 08:07
1
KUDOS
Prime Factor the number

441 = 7^2 * 3^2

# of factors is equal to the product of each prime factors exponent + 1

(2+1) * (2+1) = 9

D) 9
Director
Joined: 05 Jan 2008
Posts: 707
Followers: 3

Kudos [?]: 146 [0], given: 0

Re: OG PS 209 [#permalink]  08 Mar 2008, 05:39
Terp26, nice idea to calculate the factors.

+1
_________________

Persistence+Patience+Persistence+Patience=G...O...A...L

Re: OG PS 209   [#permalink] 08 Mar 2008, 05:39
Similar topics Replies Last post
Similar
Topics:
8 How many different positive integers are factors of 441 7 13 Apr 2012, 01:42
How many different positive integers are factors of 441? A. 3 23 Jan 2008, 11:16
How many different positive integers are factors of 441? A) 8 06 Jun 2007, 18:32
How many different prime numbers are factors of the positive 4 22 Oct 2006, 22:37
How many different prime nos are factors of the positive 5 30 Jul 2006, 04:22
Display posts from previous: Sort by