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

It is currently 21 Aug 2014, 04:40

Close

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
Your Progress

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

How many 3-digit numbers satisfy the following conditions:

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
User avatar
Joined: 19 Nov 2007
Posts: 477
Followers: 3

Kudos [?]: 49 [0], given: 4

GMAT ToolKit User GMAT Tests User
How many 3-digit numbers satisfy the following conditions: [#permalink] New post 05 Jan 2008, 13:17
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
4. How many 3-digit numbers satisfy the following conditions: The first digit is different from zero and the other digits are all different from each other?

a) 648.
b) 504.
c) 576.
d) 810.
e) 672.
_________________

-Underline your question. It takes only a few seconds!
-Search before you post.

Director
Director
User avatar
Joined: 12 Jul 2007
Posts: 867
Followers: 12

Kudos [?]: 195 [0], given: 0

GMAT Tests User
Re: PS-3 digit number [#permalink] New post 05 Jan 2008, 14:32
There are 10 different integers available for us to use: 0,1,2,3,4,5,6,7,8,9

If the first digit is different from 0 we have 9 to choose from

Now they say the "other digits are different from each other" so the 2nd and 3rd can't be the same one, but one of them CAN be the same as the first digit. This gives us 10 choices for the 2nd digit and 9 choices for the third(since it cannot be identical to the second).

Options for first digit * options for second * options for 3 = number of 3 digit numbers that satisfy the conditions

9*10*9 = 810

Answer D
Re: PS-3 digit number   [#permalink] 05 Jan 2008, 14:32
    Similar topics Author Replies Last post
Similar
Topics:
Combinations - how many 3 digit numbers? Forrester300 4 03 Mar 2009, 16:33
How many 3-digit numbers satisfy the following conditions: jodeci 1 08 Apr 2006, 15:09
How many 3 digit odd numbers can be formed from the set of rxs0005 7 13 Jan 2005, 05:22
How many 3- digit numbers between 100 and 200 have a digit Seyi 5 11 Nov 2004, 07:54
Display posts from previous: Sort by

How many 3-digit numbers satisfy the following conditions:

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.