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ar⁴=48
--------
r³=8
r=2
ar=6
a=3
suku pertama =3
U2 = 6
U5 = 48
Rumus : Un = a.r^(n-1)
jadi
U2 = a.r^ (2-1) = a.r = 6 ----> a = 6/r
U5 = a.r^(5-1) = a.r^4 = 48
Jadi (6/r) x r^4 = 48
6.r³ = 48
r³ = 48/6 = 8
r = ∛8 = 2
a.r = 6
2a = 6
a = 6/2 = 3 <----- U1