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May
17
comment Non-recursive formula for calculating the number of ways of arranging k elements in an n-element list so that no three elements are in adjacent cells?
Oh, I see! Thanks a lot :)
May
17
accepted Non-recursive formula for calculating the number of ways of arranging k elements in an n-element list so that no three elements are in adjacent cells?
May
17
comment Non-recursive formula for calculating the number of ways of arranging k elements in an n-element list so that no three elements are in adjacent cells?
Thank you for the reply. Why do we know the string always ends in 0, 01, or 011, though? Can't a string of length 1 end in 1 as well as 0?
May
16
asked Non-recursive formula for calculating the number of ways of arranging k elements in an n-element list so that no three elements are in adjacent cells?
May
13
accepted A seemingly easy combinatorics brain teaser
May
13
comment A seemingly easy combinatorics brain teaser
@BrianTung - I saw it during one of the meetups about algorithms, puzzles and such at my uni at it's been bugging me :) There wasn't a specific question about a closed-form expression, just something like "how would you go about finding an algorithm for solving it for an arbitrary n?".
May
13
asked A seemingly easy combinatorics brain teaser
Nov
8
awarded  Popular Question
Jul
2
awarded  Curious
May
21
comment Hanging pictures in the rooms
Why did we double subtract those? Didn't we only subtract the six rooms scenario?
May
21
revised Hanging pictures in the rooms
added 1 character in body
May
21
asked Hanging pictures in the rooms
May
14
accepted How many positive integers smaller than $1000$ and non-divisible by either $2$, $3$ or $5$ are there?
May
14
comment How many positive integers smaller than $1000$ and non-divisible by either $2$, $3$ or $5$ are there?
I see, thank you :)
May
14
comment How many positive integers smaller than $1000$ and non-divisible by either $2$, $3$ or $5$ are there?
@Jean-ClaudeArbaut - I see, thank you. Of course the "and so on" was my bad :)
May
14
asked How many positive integers smaller than $1000$ and non-divisible by either $2$, $3$ or $5$ are there?
May
14
revised Predicting final standings in combinatorics
added 1 character in body
May
14
revised Predicting final standings in combinatorics
added 339 characters in body
May
14
asked Predicting final standings in combinatorics
Apr
23
accepted Can't understand trivial discrete logarithm problem