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Suppose that a particle is fired from the origin in the $(x,y)$-plane in a straight line in a direction at random angle $\Phi$ to the $x$-axis, and let $Y$ be the $y$-coordinate of the place where the particle hits the line ${x=1}$.

Can $\Phi$ bee seen as a random variable here? I want to think so but I'm not sure.

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    That is more sensible than my choice, though it makes no difference.2012-11-05

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