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A unity feedback control system is characterized by the open-loop transfer function

$G(s)=\frac{10K(s+2)}{s^3+3s^2+10}$

The Nyquist path and the corresponding Nyquist plot of $G(s)$ are shown in the figures below.

If 0 < *K* < 1, then the number of poles of the closed-loop transfer function that lie in the right-half of the *s*-plane is

- 0
- 1
- 2
- 3

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