We propose a concept of conversion factor of binomial distribution. By using this factor, the approximate classical limit of parameter for the last stage is obtained.
我们提出了二项分布折合因子的概念，利用它获得了最末阶段参数的经典近似限。
2
By means of binomial distribution the optimum redundancy logic is calculated and the boundary factor of yield is introduced to determine whether the redundancy logic is worthy.