Finding the distance to the coordinate beginning in Poisson process. $R^3$

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I have a Poisson process with intensity $\lambda$ in $\mathbb{R^3}$, the distances from the coordinate beginning are $\gamma_1, \gamma_2,...\gamma_n$ and I am to find the density function of the variable $\gamma_n$.

I have done a problem, that has similarities. The problem was finding the distance to the nearest point. With this, I am having trouble, producing anything tangible. Thoughts?