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对称性通常指图形或物体关于某个点、直线或平面而言,在大小、形状、排列上具有的一一对偶关系.数学中的对称性既有图形、数式的对称,也有概念、命题、法则或结构的对称.数学中的对称性不仅是一种美的享受,也是一种数学思想和方法.如果在概率计算中有意识地利用事物的对称性,使思维与推理高度统一,不仅可以更好地把握事物的本质,还能简化解题过程,起到事半功倍的效果.例1设甲抛n+1次硬币,乙抛n次硬币,求甲所抛正面数多于乙所抛正面数的概
Symmetry usually refers to a one-to-one relationship between a figure, an object, and a point, line, or plane in terms of size, shape, arrangement, etc. Symmetry in mathematics is not only graphically and logarithmically symmetric, but also concepts, propositions, The symmetry of the law or the structure.The symmetry in mathematics is not only a kind of beauty to enjoy, but also a kind of mathematical thought and method.If the symmetry of things is consciously used in probability calculation and the thinking and reasoning are highly unified, it is not only better To grasp the essence of things, but also to simplify the process of solving problems, play a multiplier effect.Example 1 set A n + 1 coin throwing, B throwing n coins, find a positive number of positive than the number of positive B Probably