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In a previous work by the authors, a deterministic approach was used to evaluate the sparse-matrix technique for solving a large system of equation . In this paper, a probabilistic approach is used to further study the sparse-matrix technique. Analytic expressions for both the most probable number of fill-ins and the most probable optimal pivot for minimum fill-in in random sparse matrices has been obtained. Probabilistic prediction is also made for the fill-in, as well as the upper bound of the fill-in for randomly generated sparse matrices.