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U6=ar^5=96
=ar.r^4=96
6.r^4=96
r^4=96/6=16
r= 2
ar=6
a.2=6
a=6/2=3
S5=a(r^n -1)/r-1
= 3(2^5-1)/2-1
= 3(32-1)
= 3.31=93