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July 15th, 2008, 12:34 PM  #1 
Newbie Joined: Jul 2008 Posts: 2 Thanks: 0  Code generation, probability of generating same code twice
I'm developing a web application and am using a piece of code to generate a 16 character code. The code can be made up of az 09. So, Each space in the 16 character code can generate 1 of 36 characters. What is the probability of generating the exact same code twice? Is it 36^16 ? Thanks for the assistance 
July 15th, 2008, 04:44 PM  #2 
Senior Member Joined: Oct 2007 From: Chicago Posts: 1,701 Thanks: 3  Re: Code generation, probability of generating same code twice
Well, there are 36^16 possible permutations; the actual probability of generating the same code twice is actually dependent on a lot of factors... And I'm not actually sure how to do the calculation... I keep second guessing all of my thoughts. But the probability is ridiculously small, nonetheless. 
July 15th, 2008, 07:07 PM  #3 
Newbie Joined: Jul 2008 Posts: 2 Thanks: 0  Re: Code generation, probability of generating same code twice
ha Thanks. I asked someone else and we did a little math and found that the probability is around 8 trillion trillion, or 8 million million million million. I'd say yeah it's next to impossible to generate the same code twice 

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code, generating, generation, probability 
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