Page 26 - Math SL HB Sem 1

UENCI.] AND SIlRilrS

Exantple 2: Find the srun of thc first n terms of geometric series

,.(:).(:),.

Find the smallest number olterm n so that the sum ofthese series is greater
than 20

l0
Example 3: Evaluare l0.OSl
,=l

Example 4: Find the sum to n terms of the following series

(a)x+x2+xr+... (b) I -y 1y'- ...

2-t4