This sounds like one of those interview questions: "How many petrol pumps are there in North America" sort of thing.
Perhaps you could start at the odds being one in six billion (number of people on the planet), and cut it down from there? Maybe that route will take a (lot) longer time...
This sounds like one of those interview questions: "How many petrol pumps are there in North America" sort of thing.
Perhaps you could start at the odds being one in six billion (number of people on the planet), and cut it down from there? Maybe that route will take a (lot) longer time...