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U6/U4 = r^6-1/r^4-1
135/15 = r^5/r^3
9. = r^2
r. = 3
setelah mendapat rasio, baru tentukan u8 :
u8 = u6 x 3^8-6
u8 = 135 x 3^2
u8 = 135 x 9
u8 = 1215
maaf ya kalau salah dan hanya bisa menjawab nomor 1 :)