Use three coins, four Yang and two Yin hexagrams.

There are very few cases of divination. Basically, if you need one, it's called Yang. If three backs are shaken, but the number is relatively large, it is called Lao Yang. If there are two backs, it is called yin, and the coins are arranged in different orders, representing different hexagrams. The answer is for reference only, please don't be blindly superstitious.

Strictly speaking, it is better to use San Qian to interpret divination with copper coins. Three copper coins are more powerful. No copper coins can be used in coins.