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ar^4= 162
U2 = 6
ar = 6
cari rasio
U5/U2
ar^4/ar = 162/6
r^3 = 27
∛27 = r
3 = r
suku awalnya = a
U2 = 6
ar = 6
a x 3 = 6
a = 6:3
a = 2
maka U6
U6 = ar^6-1
U6 = ar^5
U6 = 2 x 3^5
U6 = 2 x 243
U6 = 486