Geometric Sequences & Series (Leaving Cert Mathematics): Flashcards

The sum of a geometric sequence

$a+ar+ar^2+ar^3+ar^4+...$

$S_n=\frac{a(1-r^n)}{1-r}$

First term

Common ratio

Number of terms

$\frac{1}{2}$

$\frac{1023}{8}$