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U3=ar^2=18
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r^2=9
r=3
U8=162x3x3x3
U8=4374
S8=a(r^n-1)/r-1
18=ar2
r2 = 18:a
U5=162
162=ar4
U5= a((r2) :a)2)
162=a((18:a)2)
162=a(324:a2)
162=324:a
162a=324
a=324:162
a=2
a. U3=ar2
18=2.r2
r2-18:2
r=/9
r=3
b. U8=ar7
= 2. 4^7
= 2184
c. yg c males ngerjainnya