Formulas of Arithmetic Sequences including:

General Term    tn=a+(n-1)d

Sum      Sn=(a+tn)n/2          Sn(2a+(n-1)d)n/2

Formulas of Geometric Sequences including:

General Term    tn=aRn-1

Sum      Sn=a(Rn-1),r not=1         Sn=rtn-a/r-1,r not=1         S00=a/1-r,r not=1