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

Home > Numbers
Words count (Posted on 2014-03-25) Difficulty: 4 of 5
(D3)How many subsets of (a,b,c, … x,y,z) contain no letters neighboring each other in the English ABC (26 letters)?

(D4)How many "words" (i.e, ordered subsets from (a,b,c, … x,y,z)) contain no neighboring letters that neighbor each other in the English ABC (26 letters)?

No Solution Yet Submitted by Ady TZIDON    
No Rating

Comments: ( Back to comment list | You must be logged in to post comments.)
re(2): solution to part 1; thoughts on part 2 | Comment 6 of 8 |
(In reply to re: solution to part 1; thoughts on part 2 by Ady TZIDON)

According to Wikipedia the current Hawaiian language has 13 letters. Per the OEIS sequence I cite, that has over 800 million ways just of valid "words" that contain all the letters. There's probably be one or two billion altogether, and the way my program works is to find each one and count them. I think my computer's automatic logoff would take place before a solution was found.
  Posted by Charlie on 2014-03-26 08:55:42

Please log in:
Login:
Password:
Remember me:
Sign up! | Forgot password


Search:
Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (12)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2024 by Animus Pactum Consulting. All rights reserved. Privacy Information