Hey, it's my birthday the day after! What are the chances?
About 1 in 365, iirc.
1 in 133,225 isn't it? 1 in 365 for each of their birthdays to fall on any one day and 1 in (365 x 365) for them to be consecutive.
No we are talking about the chances that having stated a birthday of X that Ian W has a birthday of X+1.
The estimated probability is 1/365 however the exact probability can not be known without knowing the distribution of birthdays amongst the worlds populace.