帕斯卡三角形 Pascal Triangle
最近在cn 板看到一个数学题目， 题目是问说从A 到 B ，在从 B 到 C 只可以向上跟右走的话，一共可以用几个方式。。。
很自然的，我一看到图就然我想起Pascal Triangle。 这个Pascal Triangle 对我来说有很多用途的。
为什么我对 Pascal Triangle 有种很熟悉的感觉呢？
原因是因为以前很喜欢赌博。 那赌博跟这个有何关系呢？
因为当时总是要算一个东西， 那就是如果我有 p 的胜算， q 的败算, 要在 n 盘里 胜x 盘的 胜算是多少。。。 这个时候总是会用到 binomial distribution
用久了就会很习惯， 因为 pascal triangle 给的恰恰就是它的coefficient 。。 那个 nCr
当然这个pascal triangle 还有很多有趣的 pattern
不过先声明，本人不是什么数学家，只是一个有点好赌的数学爱好者。。。
不过看看以下这个泰国餐馆的wifi password， 然后在看看上面那个binomial distribution 的函数。。。
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