Let \( X_{(1)}, X_{(2)}, X_{(3)} \) be the order statistics of a random sample of size 3 from the distribution having p.d.f \[ f(x)=\left\{\begin{array}{ll} 1 & \text { for } 0<x<1 \\ 0 & \text { elsewhere. } \end{array}\right. \] Find the joint distribution of the range \( X_{(3)}-X_{(1)} \)
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