Sketch and label the following signals:

Sketch and label the following signals:

a) x[n] = u[n+1] + 3u[n] -4u[n-2]

b) x[n] = (n+1) (u[n+1]-u[n-3])

c) x[n] = 2 δ[n+1] – δ[n-3], y[n]= Σk=-∞ n x[k] (Running sum) 

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