EX Marks the Spot

In the town of Biddulph, 7% of all telephone subscribers are ex-directory. If you pick 500 people at random from the telephone directory, how many will have ex-directory numbers?

 

Share:

• Click to email a link to a friend (Opens in new window)
• Click to print (Opens in new window)
• Click to share on Facebook (Opens in new window)
• Click to share on LinkedIn (Opens in new window)
• Click to share on Reddit (Opens in new window)
• Click to share on Twitter (Opens in new window)
• Click to share on Tumblr (Opens in new window)
• Click to share on Pinterest (Opens in new window)

March 13th, 2011 | Category: Brain Riddle, Mathematical |  Email This Riddle

2 guesses to EX Marks the Spot

Warning: Use of undefined constant bfa_comments - assumed 'bfa_comments' (this will throw an Error in a future version of PHP) in /home/customer/www/riddledude.com/public_html/wp-content/themes/atahualpa/comments.php on line 132

• Crazynomad

  March 14, 2011 at 4:06 PM

  None, they are not in the directory.

• Dude

  March 14, 2011 at 4:17 PM

  Correct, Crazynomad!

  Ex-directory subscribers are no longer in the directory.

  You’re today’s winner.