If the characteristic equation of a feedback control system

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Technical

88

M: +2.00/-0.66

If the characteristic equation of a feedback control system is given by.
s⁴ + 20s³ + 15s² + 2s + K = 0
then the range of values of K for the system to be stable will be

[ESE 2019 Paper 2 (Technical) ECE]

A 1 < K < 2.49

B 0 < K < 1.49

C 1 < K < 4.49

D 0 < K < 3.49