Question 4, Let {an} be a sequence of real number. n starts from 1. Let a1 =1 and for any n 2 2, we have a, = 2a,-1+1. (a) Find an explict formula for an, (Hint consider b, = an +1, b, should be a sequence with nice property) (b) Find the partial sum, Sn, of an, ie Sn =E=1ª;. %3D %3D

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