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Dit: a. r=..?
b. U1=...?
c. S8=...?
Jb: a. U6/U2
=ar^5/ar=486/6
r^4=81
r^4=3^4
r=3
b. U2=ar
6=a(3)
2=a=U1
c. S8=a(r^n-1)/r-1
S8=2(3^8-1)/3-1
S8=2(6561-1)/2
S8=6561-1=6560
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