Ah, Droid!!

Discrete Mathematics Level 4

How many combinations does Android 9 point unlock have?

The Android imposes these conditions on patterns:

⚫Each pattern must connect at least four dots.

⚫The dots in the pattern must all be distinct.

⚫If the line segment connecting any two consecutive dots in the pattern passes through any other dots, the other dots must have previously been in the pattern.


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