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ar² = 18
U6 = 486
ar^5 = 486
=
=
r^3 = 27
r = 3
ar² = 18
a(3)² = 18
a(9) = 18
a = 18/9
a = 2
U8 = ar^7
= 2(3)^7
= 2 (2187)
= 4374
Maaf, kalau salah.
U3 ar² 18
r^3 =27 maka r = 3
cari nilai a = ar² = 18
a x 3² = 18
a = 9
maka U8 = ar^7 = 9 x 3^7 =19684