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Kyky
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I am a Secondary student from Hong Kong, and currently part of the Hong Kong IMO Training Program.

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4 Proof $\sum^a_{n=1}\prod^b_{x=1}(n+x)=\frac{\prod^b_{y=0}a+y}{b+1}$ Dec 17 '17
4 How to solve 1990 IMO Q3 Aug 16 '20
4 Finding specific values of $n$ such that $n^2+3n+3$ is factorisable with certain constraints on the factors Oct 19 '20
3 What is $\sum^{\infty}_{n=1}\frac1{n(n+x)}$ equal to? Sep 11 '20
3 Understanding the stars and bars formula Mar 18 '20
3 If $a$ is an odd integer, then prove that $24\mid a(a^2 - 1)$ Jan 19
2 Integral inside a limit? Jan 20
2 Solving $\lim\limits_{x \to 0}\frac{(-1)^{[x]}sin(x^2)}{x}$ Mar 18 '20
2 Finding an individual's working speed from group working speed Aug 6 '20
2 If $f$ is an even function such that $\lim_{h\to 0} \frac{f(h)-f(0)}{h}$ has some finite non zero value…[CONT] Sep 13 '20
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