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Verified answer
Deret Geometrilog u1 + log u2 + log u3 + log u4 + log u5 = 5 log 3
log (u1.u2.u3.u4.u5) = log 3^5
u1 . u2 . u3 . u4 . u5 = 3^5
a^5 . r^(1+2+3+4) = 3^5
a^5 r^10 = 3^5
(ar^2)^5 = 3^5
ar^2 = 3
U3 = ar^2 = 3