The 'paradox' refers to the fact that you can get a 50-50 chance of matching birthdays in a group of 23 people. This would be the size of a small company, large family, or a department at work. So people would notice this odd chance in a normal environment.
On Jupiter the group size swells to 122 people so the odds of a matchup won't be seen all that often. Hence no paradox.
So, you are saying that it's ab the percentage not the number of people? You mean that it won't be possible to get the 50%, right?
Do you have somewhere sth written ab the stochastic process/activity? I'd like to have a look at it. 10x!