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Feb
3
awarded  Popular Question
Dec
8
comment Calculating the area of a triangle assuming you don't know Heron's formula
Thank you a lot :)
Dec
8
accepted Calculating the area of a triangle assuming you don't know Heron's formula
Dec
7
comment Calculating the area of a triangle assuming you don't know Heron's formula
@AndréNicolas - thank you. Could we do something if we didn't know trigonometry as well?
Dec
7
asked Calculating the area of a triangle assuming you don't know Heron's formula
Oct
8
awarded  Popular Question
Sep
19
awarded  Popular Question
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?