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u3 = ar^2 = 135
r^2 = u3/a = ar^2 / a = 135/15
r^2 = 9
r =√9 = 3
u5 = ar^4
= 15 x 3^4
= 15 x 81
= 1.215
U3=135
S5:........?
,u3/u1=ar2/ar=135/15 ,r2=9,r=3
U1=ar=15
a.3=15
a=5
S5=a(rn-1)/r-1=5(3pangkat 7-1)/3-1
=5(2187-1)/2
=5(1093)=5,465