This article is concerned with the reliability analysis of a weighted-k-out-of-n:G system consisting of two types of components. The system is assumed to have components which are classified into two groups with respect to their weight and reliability, and it is assumed to operate if the total weight of all working components exceeds a prespecified threshold . The reliability properties of such a system are studied. The optimal values of the number of components in each group are also determined under a minimum required reliability by minimizing the total acquisition cost.
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