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u2 = 1/4
r = u2/u1
r = 1/4 / 1
r = 1/4
un = ar^(n-1)
un = 1 x (1/4)^(n-1)
un = (1/4)^n / 1/4
un = 4 x (1/4)^n
R = 1/4 : 1 = 1/4
Un = U₁ . R (Pangkat n -1 )
= 1 . 1/4 (Pangkat n - 1 )
= 1/4 (Pangkat n - 1 )