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If a hash/password is 64 characters long and consists out of 36 possible characters (a-z, 0-9). How many combinations of the hash/password do I have if I exclude the possibility that I have more than 2 same characters every 3+ characters. Example: "aa22dd" is allowed "aaa22dd" is not allowed

 Mar 14, 2016
 #1
avatar+2499 
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i think: 

the first two can be any number so there is 36 possibilities on the third you are not allowed to repeat so yo you have 35 posibilities on the fourth one you can put any character so you have 36 and so on:

(36-2)/2=17


36^2*35^17*36^17 = 65902860965567704608604298035681925529600000000000000000

  

i think i understood it wrong that is why i get a very big number :)

 Mar 14, 2016
 #2
avatar+118706 
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This one is MUCH harder than you have made it Solviet.

Nauseated might come up with a neat formula for you but if you want to work it out logically that might be a real challenge ://

I'll think on it ://

 Mar 17, 2016

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