Exercise 3. For a and b in R defined for 15, 2 by s we consider the Sequence Un = a + b Un-1 with Us za a) Show that S(Unti-un) (Un-Un-1) 20 [Tun+₁ = un] .

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A: ∑i=02a2i=∑i=02-12i22i            =∑i=024i            =40+4+42            =21

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