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U5 = S5 - S4
= (2.3^(5 - 2)) - (2.3^(4 - 2))
= (2 x 27) - (2 x 9)
= 54 - 18
= 36
=2.3^-1=2/3
s5=2.3^5-2
=2.3^3=2.27=54
U5=S5xS1=54x2/3=108/3=36