Young
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 14h accepted proof by CP$\binom{m}{1} S_{1}(n)+\binom{m}{2} S_{2}(n)+\binom{m}{3} S_{3}(n)+ \cdots +\binom{m}{m-1} S_{m-1}(n)=(n+1)^m-(n+1)$ 14h comment proof by CP$\binom{m}{1} S_{1}(n)+\binom{m}{2} S_{2}(n)+\binom{m}{3} S_{3}(n)+ \cdots +\binom{m}{m-1} S_{m-1}(n)=(n+1)^m-(n+1)$ thank you for your answer 1d asked proof by CP$\binom{m}{1} S_{1}(n)+\binom{m}{2} S_{2}(n)+\binom{m}{3} S_{3}(n)+ \cdots +\binom{m}{m-1} S_{m-1}(n)=(n+1)^m-(n+1)$ 1d accepted How many pairs $(a,b)$ of integers such that , $a^2b^2=4a^5+b^3$ 2d comment How many pairs $(a,b)$ of integers such that , $a^2b^2=4a^5+b^3$ It's JMO problem 2d revised How many pairs $(a,b)$ of integers such that , $a^2b^2=4a^5+b^3$ added 1 character in body; edited title 2d asked How many pairs $(a,b)$ of integers such that , $a^2b^2=4a^5+b^3$ Apr 24 accepted How to proof $\sum^{n}_{k=1}\sin^2\left(x+ \frac{\pi(k-1)}{n} \right)=\frac{n}{2}$ Apr 23 asked How to proof $\sum^{n}_{k=1}\sin^2\left(x+ \frac{\pi(k-1)}{n} \right)=\frac{n}{2}$ Apr 19 accepted $a,a+d,a+2d,a+3d, a+4d, a+5d, a+6d$ are all primes. Find the minimum of $a+6d$ Apr 19 asked $a,a+d,a+2d,a+3d, a+4d, a+5d, a+6d$ are all primes. Find the minimum of $a+6d$ Apr 18 comment How to show that ($m,n\in \mathbb{N}, m>n$) ${\frac{ \left( m+n \right)^{m+n}}{m^{m} n^{n}}} > 2^{2n}$ Thank you nice answers. Apr 18 comment How to show that ($m,n\in \mathbb{N}, m>n$) ${\frac{ \left( m+n \right)^{m+n}}{m^{m} n^{n}}} > 2^{2n}$ Thank you nice answers. Apr 18 accepted How to show that ($m,n\in \mathbb{N}, m>n$) ${\frac{ \left( m+n \right)^{m+n}}{m^{m} n^{n}}} > 2^{2n}$ Apr 18 revised How to show that ($m,n\in \mathbb{N}, m>n$) ${\frac{ \left( m+n \right)^{m+n}}{m^{m} n^{n}}} > 2^{2n}$ deleted 2 characters in body; edited title Apr 18 asked How to show that ($m,n\in \mathbb{N}, m>n$) ${\frac{ \left( m+n \right)^{m+n}}{m^{m} n^{n}}} > 2^{2n}$ Apr 17 accepted Find maximum of $f(x)=\frac{x^m(1-x)^n}{x(1-x)}$ on $0< x< 1$ Apr 17 asked Find maximum of $f(x)=\frac{x^m(1-x)^n}{x(1-x)}$ on $0< x< 1$ Apr 17 accepted Show that $\tan \alpha \tan \beta + \tan \beta\tan \gamma +\tan \gamma\tan \alpha =1$ Apr 17 comment Show that $\tan \alpha \tan \beta + \tan \beta\tan \gamma +\tan \gamma\tan \alpha =1$ Coment thank you!