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Possible Duplicate:
Combination of smartphones' pattern password

I just came across with this interesting question from my colleague. I'm trying now, but meanwhile i thouht i could share here.

With the password grid shown in android home screen, how many valid passwords are possible? min password length: 4 max: 9 (correct me if i'm wrong)

I'm looking for math approach, rather eliminating invalid combinations from all combinations.

Thanks.

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    @Theo: Thanks for the links; believe it or not, I’ve never actually used a cell phone of any kind. (Don’t much like phones of any kind.)2011-08-08

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