Answer
$\dfrac{17}{6}$
Work Step by Step
Consider two geometric series: $(1+1)+(\dfrac{1}{2} -\dfrac{1}{5})+(\dfrac{1}{4} +\dfrac{1}{25})+(\dfrac{1}{8} -\dfrac{1}{125})+...$
Here, $a=5, r=\dfrac{1}{2}$ and $a=1, r=\dfrac{-1}{5}$
Formula to find the sum of a geometric series is
$S=\dfrac{a}{1-r}$
or, $S=s_1 +s_2=\dfrac{1}{1-\dfrac{1}{2}}+\dfrac{1}{1+\dfrac{1}{5}}$
or, $S=2+(\dfrac{5}{6})=\dfrac{17}{6}$
