A sphere is placed inside a right cir...

A sphere is placed inside a right circular cylinder so as to touch the top, base and lateral surface of the cylinder. If the radius of the sphere is `r ,` then the volume of the cylinder is `4pi\ r^3` (b) `8/3pi\ r^3` (c) `2pi\ r^3` (d) `8pi\ r^3`

`2pi R^3`

`8pi R^3`

`4/3 pi R^3`

none of these

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