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12 = ar²
U5 = ar^4
48 = ar^4
cari rasio
U5/U3
ar^4/ar² = 48/12
r² = 4
r = √4
r = 2
cari suku awal
12 = ar²
12 = a x 2²
12 = a x 4
12 : 4 = a
3 = a
U8 = ar^8-1
U8 = ar^7
U8 = 3 x 2^7
U8 = 3 x 128
U8 = 384