All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Just Math
Getting 13 (Posted on 2014-07-21) Difficulty: 3 of 5
Using integers 1,2,3 & 4 only , in how many distinct ways a sum of 13 can be achieved?

Rem: The order matters i.e. 1,4,4; 4,1,4; & 4,4,1 are considered distinct.

See The Solution Submitted by Ady TZIDON    
Rating: 4.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution comparing two approaches | Comment 3 of 5 |

I was about  to provide a hint, to address tomarkin's doubts and after reading your solution I admit that what you did is exactly what I had in mind.

Although both of you reacched the correct answers, F(13)=1782
it  is quite difficult  to evaluate, say,  F(33) using the direct method, while it  is a single column in Excel to get it in no time.

I am going to use your detailed explanation as the official solution.


  Posted by Ady TZIDON on 2014-07-22 10:05:47
Please log in:
Remember me:
Sign up! | Forgot password

Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (5)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Copyright © 2002 - 2021 by Animus Pactum Consulting. All rights reserved. Privacy Information