The characteristic equation of a closed loop system is given

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The characteristic equation of a closed loop system is given by— s⁴ + 6s³ + 11s² + 6s + K = 0 Stable closed loop behaviour can be ensured when gain K is such that—

1. 0 < K < 10
2. K > 10
3. – ∞ ≤ K < ∞
4. 0 < K ≤ 20

Correct Option: A

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