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a.r = 8
u5 = 1
a. r⁴ = 1
cari rasio nya dulu
u2 / u5
ar / ar⁴= 8/1
coret a nya
r/r⁴= 8
r-³ = 8
r = 1/2
suku pertama
a.r = 8
a. 1/2 = 8
a = 16