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The range of $K$ for which all the roots of the equation $s^{3}+3s^{2}+2s+K=0$ are in the left half of the complex $s$-plane is

  1. $0 < K < 6$
  2. $0 < K < 16$
  3. $6 < K < 36$
  4. $6 < K < 16$
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