For the discrete time system of the given figure

1.

For the discrete time system of the given figure

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[A].	yk - 0.5 yk - 1 - 0.25 yk - 2 = uk
[B].	yk + 0.5 yk - 1 - 0.25 yk - 2 = uk
[C].	yk - 0.5 yk - 1 + 0.25 yk - 2 = uk
[D].	yk + 0.5 yk - 1 + 0.25 yk - 2 = uk

Answer: Option C

Explanation:

u_k + 0.5 y_{k - 1} - 0.25 y_{k - 2} = y_k.

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