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b. rasio : U2 : U1 = 16 : 8 = 2
c. U10 = ar^n-1
= 8 . 2^9
= 4096
2. gini , kan U2 = ar
ar = 192
a = 192/r . . . . ( persamaan 1 )
nah , kan U5 = ar^4
ar^4 = 24 . . . . .. ( persamaan 2 )
nah , persamaan 1 di masukkin ke persamaan 2
192/r . r^4 = 24
192 . r^3 = 24
r^3 = 0,125
r = 0.5
suku pertama = U1 = a
pake U2 aja nyarinya . U2 = ar
192 = 0.5a
a= 384
suku ke 4 = U4 = ar^3
384.0.125 = 48
CMIIW