Why does the coin in the Book of Changes represent the number 3 on the front and the number 2 on the back?

The Book of Changes pays attention to the three talents of heaven and earth, so divination in the basic eight natural phenomena ends with three hexagrams. Even the divination ends three times, and so does the coin. It takes three throws to determine the number, and the explanation of gossip is based on Zhou Wenwang's sixty-four hexagrams, so nine is Lao Yang, six is the number of old yin, and old yin is the boundary between yin and yang. Therefore, the highest sum of the three coins is 9, and the lowest sum is 6, so the coin is positive upward, positive outward, negative downward, and negative downward, reverse and inward, so 9/3=3, 6/3=2, so in the Book of Changes, the positive side of the coin represents the number 3 and the negative side represents the number 2.