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6 = ar
U5 = ar^5-1
48 = ar^4
cari rasio
ar^4/ar = 48/6
r^3 = 8
r = ∛8
r = 2
cari suku awal
U2 = ar
6 = ar
6 = a × 2
a = 6:2
a = 3
maka U4
U4 = ar^4-1
U4 = ar³
U4 = 3 × 2³
U4 = 3 × 8
U4 = 24