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U6=ar^5 = 486
cari rasio
ar^5/ar² = 486/18
r³ = 27
r=∛27 = 3
cari a
ar²=18
a.3²=18
a.9=18
a=18/9=2
U8 = ar^7
U8 = 2.3^7
U8 = 2. 2187
U8=4374