It is currently 22 Oct 2017, 00:00

### 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

# (P/S) What is the biggest prime factor?

Author Message
Manager
Joined: 02 Apr 2006
Posts: 93

Kudos [?]: 54 [0], given: 0

(P/S) What is the biggest prime factor? [#permalink]

### Show Tags

26 Nov 2007, 05:43
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Question)
If <n> means the production of all the positive even numbers until n(including n), what is the Biggest prime factor of <20>+<22>?

Kudos [?]: 54 [0], given: 0

VP
Joined: 10 Jun 2007
Posts: 1434

Kudos [?]: 351 [0], given: 0

Re: (P/S) What is the biggest prime factor? [#permalink]

### Show Tags

26 Nov 2007, 16:42
pretttyune wrote:
Question)
If <n> means the production of all the positive even numbers until n(including n), what is the Biggest prime factor of <20>+<22>?

<20> = 2*4*6*...*20
<22> = 2*4*6*...*20*22

<20>+<22> = (2*4*6*...*20) + (2*4*6*...*20*22) = (2*4*6*...*20)*(1+22) = (2*4*6*...*20)*23

Since 2 is the only even prime number and no multiplication is greater than 23 and 23 is a prime number, 23 is the answer.

Kudos [?]: 351 [0], given: 0

SVP
Joined: 29 Aug 2007
Posts: 2472

Kudos [?]: 844 [0], given: 19

Re: (P/S) What is the biggest prime factor? [#permalink]

### Show Tags

26 Nov 2007, 17:00
bkk145 wrote:
pretttyune wrote:
Question)
If <n> means the production of all the positive even numbers until n(including n), what is the Biggest prime factor of <20>+<22>?

<20> = 2*4*6*...*20
<22> = 2*4*6*...*20*22

<20>+<22> = (2*4*6*...*20) + (2*4*6*...*20*22) = (2*4*6*...*20)*(1+22) = (2*4*6*...*20)*23

Since 2 is the only even prime number and no multiplication is greater than 23 and 23 is a prime number, 23 is the answer.

absolutly agree with 23.

Kudos [?]: 844 [0], given: 19

Re: (P/S) What is the biggest prime factor?   [#permalink] 26 Nov 2007, 17:00
Display posts from previous: Sort by