lin7xu's blog

Can't enter Opencup contest
By lin7xu, history, 2 years ago, In English

I can't enter any XIX Open Cup and before. It shows The virtual contest is in progress. You are not allowed to participate. Can anyone deal with it please? snarknews

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I have a math problem
By lin7xu, history, 2 years ago, In English

How to calculate the coefficient of $$$\prod\limits_{i=0}^{p-1}(x+i) \bmod p$$$ ($$$p$$$ is a prime)? Thank you for reply.

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A math fomula
By lin7xu, history, 3 years ago, In English
$$$\huge\binom{2n}{n}\approx \frac{2^{2n}}{\sqrt{n}}$$$

Can someone tell me why?thx

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