Go to navigation
It is currently Fri Dec 09, 2016 3:23 pm

All times are UTC




Post new topic Reply to topic  [ 2 posts ] 
Author Message
 Post subject: maths
PostPosted: Sun Jan 11, 2015 2:47 pm 
What is the easy way to answer the following questions?

Here are two ways of making a total of 12 from three different whole numbers:
2+3+7=12. 3+4+5=12

A) Write down all the ways of making a total of 12 using three different whole numbers (don't count 2+3+7 as different from 2+7+3)

B) how may ways are there of making a total of 15 using three different whole numbers


Last edited by Apple33 on Tue Mar 17, 2015 9:40 pm, edited 1 time in total.

Top
  
 
PostPosted: Sun Jan 11, 2015 2:55 pm 
Offline

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11953
I 'd start by thinking about two numbers that add to 12

1 + 11

now split the 11 into two numbers 1 + 2 + 9, 1 + 3 + 8, 1 + 4 + 7, 1+ 5 + 6 others are duplicates or repeat ( 1 + 1 \+ 10)

then repeat


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 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