Question

Geometric series

Answer 1

Definition of a geometric progression \( a_1,a_2,a_3...\)
$$ \frac{a_2}{a_1} = \frac{a_3}{a_2}$$

Answer 2

Can you continue from here.

Answer 3

This is what I've tried but the answer at the back is 166.25

Answer 4

\[\frac{a(1-r^n)}{1-r}\]

Answer 5

is what you should have calculated

Answer 6

coz \(\sum_{i=0}^n x^i = \frac{1-x^{n+1}}{1-x}\) Your 5 should be a 6 at the bottom of the page.