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

 It is currently 07 Jul 2015, 08:07

### 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

# For which of the following values of x is the equation

Author Message
TAGS:
Intern
Joined: 03 Apr 2006
Posts: 46
Followers: 0

Kudos [?]: 9 [0], given: 0

For which of the following values of x is the equation [#permalink]  09 Jun 2007, 15:15
For which of the following values of x is the equation (x+4)!/x!= (x + 1)! true?

6

7

8

9

10
Director
Joined: 13 Mar 2007
Posts: 545
Schools: MIT Sloan
Followers: 4

Kudos [?]: 28 [0], given: 0

(A)

did nothing great - just substitued the value and it worked !

is there any other way?
CEO
Joined: 17 May 2007
Posts: 2994
Followers: 59

Kudos [?]: 484 [0], given: 210

You can simplify a little bit.

(x+4)! / x! can be written as (x+4)(x+3)(x+2)(x+1) --> LHS
(x+1)! = (x+1)(x)(x-1).... (1) --> RHS and u can cancel out (x+1)
so now the equation looks like :
(x+4)(x+3)(x+2) = x!

Pluggin in values is slightly easier now. Answer is still 6

which is A
Similar topics Replies Last post
Similar
Topics:
which of the following is a value of X for which 2 19 Nov 2008, 18:44
For which of the following values of X is the equation 7 29 Dec 2007, 01:17
Which of the following describes all values of x for which 1 2 23 Aug 2007, 17:18
Which following equation has exact one point with x and y is 1 18 Aug 2006, 07:32
For which of the following values of x is the equation 2 30 Oct 2005, 21:04
Display posts from previous: Sort by