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What is volume of the frustum of a cone ...

What is volume of the frustum of a cone with height h and radii `r_(1),r_(2)` ?

A

`3H(p+Q+sqrt(PQ))`

B

`H(P+Q+ sqrt(PQ))`

C

`H(P+Q+sqrt(PQ))//3`

D

`H(P+Q-sqrt(PQ))//3`

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