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Which of the following points is NOT on the root locus of a system with the open-loop transfer function $\mathrm{G}(s) \mathrm{H}(s)=\frac{k}{s(s+1)(s+3)}$

  1. $s=-\mathrm{j} \sqrt{3}$
  2. $s=-1.5$
  3. $s=-3$
  4. $s=-\infty$
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