单双概率计算公式

简介：The elves saw that their princess had not come back for a long time, so they sent a large number of people to find the whereabouts of the princess among the human families. Naturally, there is a special way of contact between the elves and the elves. Although the appearance of the elf princess has changed, in the Despite a large number of elves searching, the elf princess was still found.