Let d [n] denote the unit impulse signal in discrete time and u [n] denote the unit step signal in discrete time. If an input signal x [n] = 3 u [n] is applied to a system with a unit impulse response h [n] = d [n] + 2 d [n-1], what will be the output signal y [n] of the system? 9 u [n-1] 3 d [n] + 6 d [n-1] d [n] + 2 d [n-1] u [n] + 2 u [n-1] 3 u [n] + 6 u [n-1] 9 d [n] 9 d [n-1] 9 u [n]

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