怎么推算大小单双的概率

简介：Li Yan, whose original name was Li Xin, was born in Qixian County, Kaifeng Prefecture, Henan Province. He was elected in the year of Dingmao in Tianqi. It was extremely rare in the late Ming Dynasty for a person with a good reputation to join a bandit. However, Li Zicheng had two of them, one was Niu Jinxing, who was known as a wise man, and the other was Li Yan.