(b) For the recurrence ax = a 1 - 1. do = 4, i) List the first 5 values of the recurrence. ii) Find the solution to each of the recurrence relation with the given initial conditions. Use an iterative approach (backward or forward substitution) to come up with a closed formula. (c) Compute each of these double sums: 1) (21 +3]) in E ii)