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If $\;px^2+\large\frac{q}{x}\;\geq\;r\;$ for every +ve x $\;(p>0 , q>0)\;,\;$ then $\;27pq^2\;$ can not be less than

$(a)\;r^3\qquad(b)\;4r^3\qquad(c)\;8r^3\qquad(d)\;4r^2$

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