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U5 = 12
U8 = 96
S8 = ?
pertama kita harus menentukan R
U8 = U5.R³
96 = 12.R³
R³ = 96/12
R³ = 8
R = 2
kedua kita menentukan A atau suku pertama
U5=A.R^4
12 =A.2^4
A = 12/16
A = 3/4
langkah terakhir di lampiran