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The characteristic equation for a system is

                                                    $S^{3}+9S^{2}+26S+12(2+K{_c}) = 0$.

Using the Routh test, the value of  $K{_c}$ that will keep the system on the verge of instability is

  1. $20.9$
  2. $18.4$
  3. $17.5$
  4. $15.3$
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