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S∞ = a (1-rⁿ) / 1-r
r= U3/U2
r= 9/16 : 5/4 = 9/4 x 1/5 = 9/20
S∞ = a / 1-r
= 1 / 1- 9/20 = 1/ 11/20 = 20/11