Tentukan rumus suku ke n dari barisan geometri 9,27,81,243....

a = 9
a.r = 27
a.r^2 = 81
a.r^3 = 243

a = 9
r = 27/9 
r = 3

ar^n-1
ar^n.r^-1
ar^n .1/r
9.3^n x 1/3
= 9/3 . 3^n
= 3 . 3^n

*semoga membantu* :)