+1, where b =3b-1+5. For each Consider the sequences {n}, where an=2n+1 and {b}, sequence and n 0 and b = -2. Answer the following exercises. Show work for exercises C-E. In particular show the term that is obtained each time a summand is evaluated and show how the terms are added to obtain the overall sum. [A summand is an expression within a sum.] A. List the first three terms of {a}. [5 points] B. List the first three terms of {b}. [5 points] C. Evaluate b. [5 points] i=0 D. Evaluate ab. [5 points] i=0 E. Compute the double sum ab. [5 points] i=0j-0