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n2=ar⁵⁻¹=2
=ar⁴=2
n5=ar=16
...............ELIMINASI N2 DGN N5
r=1/2
..........SUBSITUSI UTK MENCARI a
ar=16
a×1/2=16
a=32
jadi n9=ar^(n-1)
=32.(1/2)⁸
=1/8