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The volume of air in a hollow cylinder is $450 \text{ cm}^3$. A cone of same height and radius as that of cylinder is kept inside it. The volume of empty space in the cylinder is
- (a)$225 \text{ cm}^3$
- (b)$150 \text{ cm}^3$
- (c)$250 \text{ cm}^3$
- (d)$300 \text{ cm}^3$
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Ans: (D) $300 \text{ cm}^3$