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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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