Mathematical Formulaes

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Symbol	Formula	Eg.
$\sum_{i=1}^n c$	cn	c + c + c + ... + c
$\sum_{i=1}^n i$	$\frac {n(n+1)} 2$	1 + 2 + 3 + ... + n
$\sum_{i=1}^n i^2$	$\frac {n(n+1)(2n+1)} 6$	1 + 4 + 9 + ... + n^2
$\sum_{i=0}^n {r^i}$	$\frac {r^{(n+1)} - 1} {r-1}$	$r^1 + r^2 + r^3 + r^n$