  The one dimensional probabilistic toy model of particle scattering theory is
proposed. The toy model version of scattering probability is proved to be equal
to the hypervolume of a n-dimensional figure. The solution for any n-particle
toy model is presented as a contour integral, through Mellin trasnformation.
The method of solving the contour integral is discussed. A nontrivial symmetry
of this toy model, the invariance on initial position of the particles, is
observed.
