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tapi kok gag ada di pilihan ganda...
U5=ar^4=80
U5=ar^2.r^2=80
U5=20.r^2=80
r^2=4
r=2
U3=a.4=20
a=5
S8=5(2^8-1)/2-1=5.255=1275 jawaban gak ad di pilihan ganda