大小单双概率计算公式

简介：A pair of father and son, the middle-aged man is wearing a silver suit and leather shoes, he is meticulous, his brows are knitted together, he has a Chinese character face, thick eyebrows and big eyes, and he looks like a boss to others; the remaining one is a boy with a good figure. He is somewhat tall and pleasing to the eye, somewhat similar to a middle-aged man.