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If the roots of the equation $x^3+bx^2+cx-1=0$ form an increasing G.P., then $b$ lies in which interval?

$\begin{array}{1 1}(A) \; (-3,\infty)\\(B)\;(-\infty,-3)\\(C)\;(-1,\infty)\\(D)\; (-\infty,-1)\end{array}$

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