Android lock screen

In the above passcode, we mark the points 1-5-9-6-3-7.

How many combinations does Android 9 point unlock have?

  • Each pattern must connect at least four dots.
  • The marked points are distinct.
  • Once the point is marked it can not be marked again.
  • You can jump over a marked point, but cannot jump over an unmarked point. For example, at the start we could not jump over the 5. But at the end, we jumped over the 5.
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