Equations

Geometric Sequence:

a * r ^(n-1)

Arithmetic Sequence

a+(n-1)r

What makes a converging geometric series?

-1 < r < 1

Sum of a converging/divergent geometric series

a / 1 - r

What makes a divergent geometric series?

-1 > r > 1

Simple Interest

A = P(1+nr)

Compound Interest

A = P(1+r)^n

Compound Interest over any time period

A = P(1+r/n)^nt

Binomial Theorem

n! / r!(n-r)!