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n1+n1, n2+n2, n3+n3
a =1/2 ,
r = U2/a = 1/(1/2) = 2
Un = a . r^(n-1)
Un = 1/2 . 2^(n-1)
Un = 2^-1 . 2^(n-1)
Un = 2^(-1+n-1)
Un = 2^(n-2)
keterangan tanda ^ = pangkat