The product of three numbers in GP is $216$. If $2,8,6$ be added to them in that order, we get an AP. Find the numbers.

Find the sum of the GP:

$1+3+9+27+\dots$ to $7$ terms

Find the sum of the GP:

 $1+\sqrt{3}+3+3\sqrt{3}+\dots$ to $10$ terms

Find the sum of the GP:

$0.15+0.015+0.0015+\dots$ to $6$ terms

Find the sum of the GP:

 $1-\frac{1}{2}+\frac{1}{4}-\frac{1}{8}+\dots$ to $9$ terms

Find the sum of the GP:

$\sqrt{2}+\frac{1}{\sqrt{2}}+\frac{1}{2\sqrt{2}}+\dots$ to $8$ terms

Find the sum of the GP:

$\frac{2}{9}-\frac{1}{3}+\frac{1}{2}-\frac{3}{4}+\dots$ to $6$ terms

Find the sum of the GP:

$\sqrt{7}+\sqrt{21}+3\sqrt{7}+\dots$ to $n$ terms