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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    
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  Subject Author Date
re(3): SolutionJer2014-03-26 09:21:08
Some Thoughtsre: solution to part 1; thoughts on part 2tomarken2014-03-26 09:01:02
re(2): solution to part 1; thoughts on part 2Charlie2014-03-26 08:55:42
Hints/Tipsre: solution to part 1; thoughts on part 2Ady TZIDON2014-03-26 02:25:38
Some Thoughtssolution to part 1; thoughts on part 2Charlie2014-03-25 15:41:33
re(2): SolutionCharlie2014-03-25 15:39:29
Solutionre: SolutionJer2014-03-25 15:00:05
SolutionJer2014-03-25 13:09:33
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