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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?