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Un = (13-15)n + 15 - ( 13-15 )
Un = -2n + 15 + 2
Un = 17 - 2n
U80 = 17 - 2x80 = -(160-17) = -153
D. 2/3, 5/7, 8/11, 11/15...
Un = (3n-1)/(4n-1)
U80 = (3x80 -1)/(4x80 -1) = 239/319