Jawabanmu

2014-04-28T22:52:56+07:00
A=4 | r=1/2 | Un=ar^(n-1) | Un=4×(1/2)^(n-1)=4×(1/2)^n×(1/2)^-1=4×(1/2)^n×2=8(1/2)^n semoga membantu^^ maaf berantakan