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A.R=6
Rpangkat 3=27
R=3V27
R=3
U2=ar^(2-1)
6=ar
6/r= a ..... (1)
U5=ar^(5-1)
162=ar^4 .....(2)
substitusi 1 ke 2
162=6.r^-1.r^4
162/6=r^3
27=r^3
jadi r=3
karena r=3, maka :
a=6/r =6/3=2
jadi rasio =3 dan suku pertama =2