How many kinds of mobile phone jiugongge unlock?

There are 362,880 kinds of mobile phone Jiugongge unlocking diagrams.

1. The mobile phone is unlocked at nine o'clock. When unlocking, we can choose any of the nine points. At this point, there are nine options. As shown in the figure below:

2. When unlocking, we will randomly select a point from the remaining eight points according to the principle of neither weight nor leakage. At this time, there are eight options. As shown in the figure below:

3. Next, randomly select a point from the remaining seven points, and the selection method is seven. As shown in the figure below:

4. Then, choose any point from the remaining six points and choose six methods. As shown in the figure below:

5. Choose one from the remaining five points, that is, five selection methods. As shown in the figure below:

6. Continue the above operation, and choose a point at will. There are four ways at this time. As shown in the figure below:

7. Continue to select points. There are three options at this time. As shown in the figure below:

8. Choose any point from the remaining two points. As shown in the figure below:

9. At this time, there is only one point left to choose from. According to the permutation and combination method, if each point is not weighed and unlocked, there is always a factorial selection method of 9, that is, A=9! = 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 *1= 362880, so there are 362880 unlocking methods.