Without being rigorous, I'm guessing there's about a 0.001 probability that the second three digits of a six-digit number are the same as the first three. I've had it happen a couple times with six-digit confirmation codes, but not often. I'm also guessing that there is about a 0.002 probability that one of the two sets of three digits in the next code will be the same three digits. If I'm right, that make the overall probability of those two events about two in a million.
That happened with my last two confirmation codes.
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