How can a cascade connected discrete time system respresented?

1.	How can a cascade connected discrete time system respresented?
A.	y[n] = x[n] + t[n] + r[n]
B.	y[n] = x[n] * t[n] * r[n]
C.	y[n] = x[n] * t[n] + r[n]
D.	y[n] = x[n] + t[n] * r[n]
Answer» C. y[n] = x[n] * t[n] + r[n]

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How can a cascade connected discrete time system respresented?

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