How many possible codes for a 9-dot lock-screen?

C

Clive2

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Hi. Regarding the 9-dot unlock pattern on cellphone screens.
We were discussing the chances of somebody trying n number of combos until they unlock your phone.
This got me trying to calculate the perm or find a relationship in Excel.
Can't see any pattern but found that even with 3 dots on screen it quickly mounts up to 1000's. :wtf:
So is there a formula to calculate the perm, or does anybody know? :confused:
Just for interest...
Regards, Clive.
 
The formula is the size of the character set used to the power of the length of the password.
In this case there are only 10 characters in the set (0-9) and if the you have a code with only 3 characters its 10 x 10 x 10 = 1000 possible combinations, in the case of 4 10 x 10 x 10 x 10 = 10000.


Edit: If there are only 9 dots on the screen, it means the character set is only 9 characters, so then its 9 x 9 x 9 = 729 possible combinations.
 
Last edited:
Agree with n!
First dot, can choose from 9. Second dot has only 8 possibilities. 3rd=7, etc.
9*8*7....
Unless of course you can choose sequences shorter than 9...
 
HvRooyen said:
Agree with n!
First dot, can choose from 9. Second dot has only 8 possibilities. 3rd=7, etc.
9*8*7....
Unless of course you can choose sequences shorter than 9...
Click to expand...

You can create shorter than 9 but not 1.

Most people draw a frekin Z
 
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