Study of convolution: series and parallel system 
The resulting signal when a continuous time periodic signal x(t) having period T, is convolved with itself is ___________
The convolution sum of x[n] and h[n] is given as:
We have two signals x[n] for – 5 ≤ n ≤ 2 and h[n] for 1 ≤ n ≤ 7 being finite duration signals. The range of their convolution is