If \( \lambda, \mu \) are real numbers such that, \( x^{3}-\lambda x^{2}+\mu x-6=0 \) has its re...

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If \( \lambda, \mu \) are real numbers such that, \( x^{3}-\lambda x^{2}+\mu x-6=0 \) has its real roots and positive, then the minimum value of \( \mu \) is
(a) \( 3(6)^{1 / 3} \)
(b) \( 3(6)^{2 / 3} \)
(c) \( (6)^{1 / 3} \)
(d) \( (6)^{2 / 3} \)
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