Go to navigation
It is currently Mon Dec 05, 2016 10:33 am

All times are UTC




Post new topic Reply to topic  [ 3 posts ] 
Author Message
PostPosted: Thu Jan 10, 2008 3:34 pm 
Offline

Joined: Tue Sep 04, 2007 11:10 am
Posts: 104
Can anyone help with this question which is baffling us:

The last part of a telephone number has four digits eg:

7814 1487 2103 2772

The last part of the telephone number can start with any digit apart form zero. The other three digits can by any number. How many four digit numbers are there?

Thanks!


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jan 10, 2008 5:03 pm 
Offline

Joined: Mon Dec 31, 2007 1:28 am
Posts: 91
Location: Wirral
Each number has ten possible values, 0-9, and you find the possible number of combinations by multiplying them together. So with 2 numbers it would be 10 x 10 = 100 possibles. Then x another 10 for three numbers = 1000. For the final number, if you can't have zero it's only x 9 this time, so the total would be 9000 possible numbers.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jan 10, 2008 7:35 pm 
Offline

Joined: Tue Sep 04, 2007 11:10 am
Posts: 104
That's really helpful - thanks.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
CALL 020 8204 5060
   
Privacy Policy | Refund Policy | Disclaimer | Copyright © 2004 – 2016