#1 In class, we developed the formula =1 12 = 12 =0 = 2n+3n+n (a) Use the formula (using appropriate substitutions) to find the closed form for 2n i i=1 (b) Use the formula in the notes for - 1 to find the closed form expression form for Ei ai (assume a 1 and a b) (c) In class, we developed the formula k i2. (k-1)2k+ +2 i=1 Use this formula and some algebra to derive a closed form for the sum _o(i 1)2i1 (d) Test your closed form solution in (c) to find the value of -o(i 1)2i- and see if it matches the manual computation of the 4 terms of the sum.