-yang,-yin, that is, divination, three stubborn, gossip. How to calculate these eight groups by mathematical permutation and combination? List specific formulas.

Each 1 hexagram contains three hexagrams and each 1 hexagram has two values. Therefore, the process of combining yin and yang to form divination can be completed in three steps:

1, set the first option, there are two possibilities;

2. There are two possibilities for setting the second option;

3. There are two possibilities for setting the third option;

So the number of hexagrams combined is: 2 × 2 × 2 = 8.

These eight hexagrams are collectively called gossip.