Geometric Sequences (Edexcel A-Level Mathematics): Quizzes

A common ratio between consecutive terms

$u_n = ar^{n-1}$

Divide a term by its previous term

$a = 2$

$r = \frac{1}{2}$

$25$

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

$r = -4$

$64$

Logarithms