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Which of the sequences below are causal? 1. x_n=delta_n (impulse sequence) 2. x_n=sin(pi*n) 3. x_n=(1/2)^n A 1 B 1 and 2 C 1 and 3

Which of the sequences below are causal? 1. x_n=delta_n (impulse sequence) 2. x_n=sin(pi*n) 3. x_n=(1/2)^n A 1 B 1 and 2 C 1 and 3 D 1, 2 and 3Let x_n=2^n*delta_n, where delta_n is the impulse sequence. Find the z-tranform of x_n. A 0 B 1/2 C 1 D 2

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