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maka n =
un = 3/64
12 = ar = 48r
r= 12/48 = 1/ 4
3= ar^2 = 48x(1/4)^2
un = ar^n-1
3/64 = 48x(1/4)^n-1
(1/4)^5 = (1/4)^n-1
5 = n-1
n = 6