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 Jul 27 awarded Curious Jul 26 accepted How many height arrangements are there for people? Jul 26 comment How many height arrangements are there for people? @trueblueanil: 4 is the tallest. The observer can't see 1, because 2 is blocking the view ($2 > 1$). Jul 26 comment How many height arrangements are there for people? @Shailesh: This is not true, for example: [2, 1, 3, 4], [4, 1, 2, 3] and [3, 1, 2, 4] all translate to $+$ $-$ $+$ $+$. Jul 26 asked How many height arrangements are there for people? Nov 26 revised Number of coprimes of $n$ divisible by 3 added 4 characters in body Nov 25 comment Eulers totient function divided by $n$, counting numbers in the set [1,m] that are coprime to n Answering my question: the inclusion-exclusion principle cna be used to do the counting: math.stackexchange.com/a/1038805/5758 Nov 25 answered Number of coprimes of $n$ divisible by 3 Nov 25 comment Eulers totient function divided by $n$, counting numbers in the set [1,m] that are coprime to n Is there a related theorem when $m*\omega(n)/n$ is not an integer? Where can I read more about this? Nov 25 revised Number of coprimes of $n$ divisible by 3 edited title Nov 25 comment Number of coprimes of $n$ divisible by 3 @Peter: Yes, as I wrote in my previous comment, neither $\mathrm{floor}(\varphi(3n)/3)$ nor $\mathrm{ceil}(\varphi(3n)/3)$ work. Nov 25 comment Number of coprimes of $n$ divisible by 3 @Peter: $\mathrm{floor}(\varphi(3n)/3)$ is incorrect for many numbers smaller 100. $\mathrm{ceil}(\varphi(3n)/3)$ is also incorrect for many numbers smaller 100. Both are incorrect for $n=110$ and many other numbers. Nov 25 asked Number of coprimes of $n$ divisible by 3 Oct 1 answered What is the maximum area of measurable sets on the plane with given diameter? Oct 1 asked What is the maximum area of measurable sets on the plane with given diameter? Mar 18 suggested rejected edit on Prove the convergence of $\lim_{n \rightarrow \infty} \frac{23^n}{n^{13}} \cdot \frac{1}{6}$ Oct 27 comment What is the simplest proof of the pythagorean theorem you know? You also need to prove that in the figure on the right the large white area is a square. It's obvious that all its sides have the length $c$, but are the angles right angles? Oct 2 revised Inequality…(RMO $1994$…question $8$) moved the multiplication dot above the baseline Oct 2 suggested approved edit on Inequality…(RMO $1994$…question $8$) Sep 27 awarded Critic