Series & Sequences

Arithmetic Explicit

Arithmetic Explicit

a1 + (n-1)d

Arithmetic Recursive

an-1 + d

Arithmetic Sum

n/2 * (a1+an)

Geometric explicit

a1 * r^n-1

Geometric recursive

r * an-1

Geometric Finite Sum

(a1 * (1 - r^n)) / 1-r

Geometric Infinite Sum

a1 / 1-r iff. |r| < 1