Find and sketch the output y[n] for the following cases using graphical method. a) x[n] = {1,2,3,2,1) and h[n] = {1,2,3,2,1} b) x[n] = {1,1,1,1,1) and h[n] = {1,-1} c) x[n] = {1,2,1} and h[n] = {(1,0,1} Repeat Question 1 by using numerical method.