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a.ar.ar^2=125
a^3r^3=125
(ar)^3=125
ar=5. akar pangkat 3 kan kedua ruas
un=ar^n-1
u3=10
a.r^2=10
a.r.r=10
5.r=10. masukan ar=5
r=2
substitusikan r
a.5^2=10
a.25=10
a=10/25
=2/5
tinggal masukan ketga bilangan
a + ar + ar^2
2/5 + 2/5 . 5 + 2/5 . 5^2
jadi ketuga bil itu
2/5 , 2 , 10
u1 = a/r
u2 = a
u3 = ar
u1 x u2 x u3 = 125 = a³
maka a = ∛125 = 5
u3 = 10 = 5 r
maka r = 10 : 5 = 2
u1 = a/r = 5/2
u2 = a = 5
u3 = ar = 10