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Utengah=U5=ar^4=768
U5/U2=ar^4/ar=768/12
=r^3=64
r=4
ar=12
a=3
Sn=(a(1-r^n))/(1-r)
S9=(3(1-4^9))/(1-4)
S9=(3(1-262144))/-3
S9=-(1-262144)
S9=262143