Answer
$4\Sigma_{k=1} \frac{1}{2^{k}}$
Work Step by Step
as
- k=Starting
- 4 indicates How many times it will be performed
-$ \frac{1}{2^{k}}$ shows the form which has to be used
put k=1,2,3,4
$4\Sigma_{k=1} \frac{1}{2^{k}}$=$\frac{1}{2}$ +$\frac{1}{4}$+$\frac{1}{8}$+$\frac{1}{16}$
