Jump to content


Welcome to BrainDen.com - Brain Teasers Forum

Welcome to BrainDen.com - Brain Teasers Forum. Like most online communities you must register to post in our community, but don't worry this is a simple free process. To be a part of BrainDen Forums you may create a new account or sign in if you already have an account.
As a member you could start new topics, reply to others, subscribe to topics/forums to get automatic updates, get your own profile and make new friends.

Of course, you can also enjoy our collection of amazing optical illusions and cool math games.

If you like our site, you may support us by simply clicking Google "+1" or Facebook "Like" buttons at the top.
If you have a website, we would appreciate a little link to BrainDen.

Thanks and enjoy the Den :-)
Guest Message by DevFuse
 

Photo
- - - - -

What did I do wrong? (GRE Math)


Best Answer Thalia, 10 January 2013 - 01:41 AM

Spoiler for 288

Go to the full post


  • Please log in to reply
2 replies to this topic

#1 Rob_Gandy

Rob_Gandy

    Advanced Member

  • Members
  • PipPipPip
  • 175 posts
  • Gender:Male
  • Location:Garland, TX

Posted 10 January 2013 - 01:21 AM

How many 3-digit positive integers are odd and do not contain the digit 5? 

 

I got 320, but the answer that is given in 288. I just realized that I missed some numbers, but I ended up with 280.

 

I would greatly appreciate if someone could explain why the answer is 288.


  • 0

#2 Thalia

Thalia

    Senior Member

  • Members
  • PipPipPipPip
  • 2910 posts
  • Gender:Female

Posted 10 January 2013 - 01:41 AM   Best Answer

Spoiler for 288


Edited by Thalia, 10 January 2013 - 01:42 AM.

  • 0

Come check out Mafia in the Games Forum
Trainer's Manual Mafia XII: Bugs Mafia is in signups
Other games:
The Green Glass Doors
Telephone


#3 Rob_Gandy

Rob_Gandy

    Advanced Member

  • Members
  • PipPipPip
  • 175 posts
  • Gender:Male
  • Location:Garland, TX

Posted 10 January 2013 - 01:57 AM

Thank you much. I must have done some miscounting along the way.


  • 0




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users