Please answer both questions Let X and Y he continuous realv

Please, answer both questions...

Let X and Y he continuous, real-valued random variables with joint probability density function What is the joint probability density function for X + Y? Let X1, , Xn be continuous, real-valued random variables with joint probability den-sity function where Vn is the volume of the interior of the unit sphere in n dimensions. (You can calculate this, by integration, to be for even and odd dimensions, respectively.) What is the joint probability density function for X1 + + Xn?

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