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Arithmetic sequences
an=a1+d(n-1)
geometric sequences
an=a1(r^n-1)
Arithmetic series partial sum
Sn=(n(a1+an))/2
Geometric series partial sum
Sn=(a1(1-r^n))/(1-r)
infinite sum where 1>r>-1
Sinfinite=a1(1/(1-r))