对称的概念在数学中有着非常广泛且重要的作用.在概率的计算中也常常利用这一技巧,例如在古典概型样本空间的选取时,着眼点就是要使样本点出于对称.因为古典概型和几何概型都具有对称性,也是古典概率论研究中最重要的两种模型,下面给出几个这两种模型下利用对称计算的例子.1对 The concept of symmetry has a very wide and important role in mathematics, and it is also often used in the calculation of probability, for example, in the selection of classical probabilistic sample space, the point is to make the sample point out of symmetry Both the generalized and geometrical models are symmetrical and are also the two most important models of classical probability theory. Here are some examples of the use of symmetric calculations in both models: