Answer
$19530$
Work Step by Step
Since, we have $S_n=\dfrac{a_1(1-r^{n})}{1-r}$
Here, $n=6,a_1=5,r=5$
Thus,
$S_{6}=\dfrac{5[1-(5)^{6}]}{1-5}=\dfrac{5}{-4}(-15624)=19530$
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