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Sum of an arithmetic sequence
S_{n}=(n/2)(a_{1}+a_{n})

nth term of an arithmeic sequence
a_{n}=a_{1}+(n1)d

recursive definiton of an arithmetic sequence
 a_{n}=a_{n1}+d
 a_{1}=a_{1}


sum of first n perfect squares

sum of first n perfect cubes

nth term of a geometric sequence
a_{n}=a_{1}r^{n1}

sum of finite geometric series
 s_{n}=a_{1}(1r^{n)}
 ^{ 1r}

Sum of an infinite geometric series

