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U5 = ar^4 = 16
ar.r3 = 16
128.r^3=16
r^3 = 16/128
r^3= 0.125
r = 0,5
a =
a.r = 128
a. 0,5= 128
a= 128/0.5
a= 256
s6= a(1-r^n)/1-r
s6= 256(1-0.5^6)/1-0.5
256(0,98)/0.5
125.4
maaf kalau salah ya