Answer:
The Android pattern lock comes with around 389,112 number of possible patterns. And this is much more than 4 digit pin code which is 10000 in all. We have a tendency to choose the easy ones but it can be dangerous definitely. Also for the bit strength, one dot holds one bit, and so 3 x 3 grid can hold 3 x 3 =9 bits. If you chose n out of then it will be 9CN like 9C2= 9!/2!*7!, and likewise we can calculate the bit strength, which is 9*8/2= 36 bits.
Explanation:
The answer is self explanatory.
