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u10= 20 + 10-1
u10= 20 + 9
u10= 29
U3 = ar^2 = 20
menjadi >> r^4 = 16
r = akar 4 dari 16
r = 2
mencari U1 atau a
U3 = ar^2 = 20
= a.2^2 = 20
a.4 = 20
a = 20/4
a = 5
U10 = ar^9
= 5 x 2^9
= 5 x 512
= 2560
ket: tanda ^ = pangkat
maaf kalau salah.. semoga membantu :)