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Verified answer
Dika=2
r=6/2=3
a.U8=ar^7=2.3^7=4374
b.S8=a(r^8 - 1)/(r-1)=2.(3^8 - 1)/(3-1)=6560
c.barisan geometri tersebut adalh barisan geometri naik karena setiap baris semakin besar nilainya, atau memiliki r>1.