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## Homework Statement

X1, X2, X3 are three random variable with uniform distribution at [0 1]. Solve the PDF of Z=X1+X2+X3.

## Homework Equations

## The Attempt at a Solution

PDF of Z, f_z=[tex]\int[/tex][tex]\int[/tex]f_x1(z-x2-x3)*f_x2*f_x3 dx2 dx3

I saw the answer at http://eom.springer.de/U/u095240.htm, but I cannot figure out how to get there...please help.

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