**The third term of a Geometric Sequence is 27 and the fifth term is 243. What is the sum of the first 10 terms?**

Matimatix
Jul 4, 2017

#1**+2 **

3^{1} =3

3^{2} = 9

3^{3} = 27

3^{4} = 81

3^{5} = 243

3^{6} = 729

3^{7} = 2187

3^{8} = 6561

3^{9} = 19683

__3 ^{10} = 59049__

88572

\({s}_{n} = \frac{q^n-1}{q-1}*{a}_{1}\)

q=3 n=10

Omi67
Jul 4, 2017