Sample Mathmonic
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\boxed{(x+y)^n = \sum_{k=0}^n {n \choose k} x^{n – k} y^k}
\sum_{n=a}^{b}\frac{1}{n^{2}}x = {-b \pm \sqrt{b^2-4ac} \over 2a} \boxed{(x+y)^n = \sum_{k=0}^n {n \choose k} x^{n – k} y^k} \displaystyle \lim_{x\to 1} \frac{kx^{k-1}}{Nx^{N-1}} = \frac{k}{N} \displaystyle \lim_{x\to 1} \frac{kx^{k-1}}{Nx^{N-1}} = \frac{k}{N}