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A linear time invariant (LTI) system with the transfer function 


is connected in unity feedback configuration as shown in the figure.

For the closed loop system shown, the root locus for $0< K < \infty$ intersects the imaginary axis for $K=1.5$. The closed loop system is stable for

  1. $K>1.5$
  2. $1<K<1.5$
  3. $0<K<1$
  4. no positive value of $K$
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