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a=-44
r=-1/2
U6=ar⁶⁻¹ = -44.(-1/2)⁵ = -44(-1/32) = 44/32 = 11/8
U9=ar⁹⁻¹ = -44.(-1/2)⁸ = -44(1/256) = -44/256 = -11/64