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The loop transfer function of an LTI system is G(s)H(s) =K(s+1)(s+5)/s(s+2)(s+3). For K>0, the point on the real axis that does not belong to the root locus of the system is

(a) -0.5

(b) -2.5

(c) -3.5

(d) -5.5

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Correct choice is (c) -3.5

Easiest explanation: The points present on the root locus are right to the odd number of poles and zeroes.

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