The maximum volume (in cu. m) of the right circular cone having slant height 3m is :

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The maximum volume (in cu. m) of the right circular cone having slant height $3m$ is :

(1) $3\sqrt3\pi$

(2) $6\pi$

(3) $2\sqrt3\pi$

(4) ${4\over3}\pi$
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Conic sections