Upward Lifting force on a Cone!

A conical cup of height bb, semi-vertical angle α\alpha rests open end down on a flat surface as shown. The cup is filled to height HH with liquid of density ρ\rho and a small hole is punched at the apex of the cone. The upward lifting force on the cup is F=πρg[bH2H3n]tan2αF= \pi \rho g [bH^2 - \frac{H^3}{n}] \tan^2 \alpha , then 'nn' is

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