Discrete-time signals as energy or power signals, Mathematics

Classify the following discrete-time signals as energy or power signals. If the signal is of energy type, find its energy. Otherwise, find the average power of the signal.

X1 = δ (n) +u(n),

X2 = δ (n)u(n)

where δ (n)  is the unit sample signal, u(n)is the unit step signal.

 

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