The non-computability of the probability of the consequential rare events using scientific methods (owing to the very nature of small probabilities). Success r

The non-computability of the probability of the consequential rare events using scientific methods (owing to the very nature of small probabilities). Success rate is computed and regularly measured by VCs. Otherwise rule of thumbs like 7/2/1 (On average 7 startups will just fail outright, 2 might make your money back, 1 will make you a profit) wouldn't exist.