It is currently 24 Jun 2017, 20:54

### 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

# m10q13

Author Message
Manager
Joined: 16 Feb 2010
Posts: 225

### Show Tags

21 Nov 2010, 17:25
 How many odd three-digit integers greater than 800 are there such that all their digits are different?(C) 2008 GMAT Club - m10#13 * 40 * 56 * 72 * 81 * 104If the number begins with 8, there are $$5*8 = 40$$ possibilities (5 possibilities 1,3,5,7,9for the last digit and 8 possibilities for the middle digitwhy 8? it should be 9 (0,1,2,3,4,5,6,7,9)).If the number begins with 9, there are $$4*8 = 32$$ possibilities (4 possibilities for the last digit and 8 possibilities for the middle digitsame as above...it should be 9...).In all, there are $$40 + 32 = 72$$ numbers that satisfy the constraints.The correct answer is C.

thanks
Manager
Joined: 25 Jun 2010
Posts: 91

### Show Tags

21 Nov 2010, 18:27
You are missing that the last digit and middle digit can't be same.

Posted from my mobile device
Manager
Joined: 16 Feb 2010
Posts: 225

### Show Tags

21 Nov 2010, 18:39
anshumishra wrote:
You are missing that the last digit and middle digit can't be same.

Posted from my mobile device

gotta
Re: m10q13   [#permalink] 21 Nov 2010, 18:39
Similar topics Replies Last post
Similar
Topics:
1 Question from m10 q13 2 07 Jul 2010, 01:03
27 m10 Q13 18 21 Apr 2014, 09:43
Display posts from previous: Sort by

# m10q13

Moderator: Bunuel

 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®.