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Diameter of a cylinder is (2/3)rd of sum of its radius & height, while ratio of curved surface area to volume of cylinder is 1 : 7. If radius and height of a cone is same as that of cylinder, then find slant height of cone?

A

`21 sqrt5 cm `

B

`10 sqrt5 cm`

C

`7 sqrt5 cm`

D

`14 sqrt5 cm`

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The correct Answer is:
D
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