How Many Possible Lock Patterns Does an Android Have ?

Interesting Engineering

Android users have a few options when unlocking their phones, one of them is to draw a pattern on a 3 x 3 dot matrix. The lock patterns, however, is governed by three rules:

1. A minimum of four contact points must be connected
2. A contact point can only be used once
3. An intermediate point between two connected points must be included in the pattern order, unless, it was previously used.

With this in mind, how many combinations actually exist? Watch this video to find out, and also to see why it is important to clean your smartphone's screen.

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