Pre Calculus - Chapter 09 (Discrete Mathematics) Formulas

arithmetic sequence

An = d (n-1) + A1

geometric sequence

An = A1 (r)^n-1

arithmetic series

Sn = n ((A1 + An) / 2)

geometric series

Sn = (A1 (1 - r^n)) / (1-r)

if |r| < 1

convergent

if |r| > 1

divergent

convergent series

Sn = (A1) / (1-r)