What are the odds of turning 13 on Friday the 13th?

Answer 1

The answer is approximately one in 213, and here is why;

1. There are 12 chances, in that year, of your birthday being on the 13th of a month, in 365.25 days (remember leap years).

2. There is a 1 in 7 chance of it being on a Friday, therefor:

If you divide 12 by 365.25 (365 and a quarter), and then by 7, you get 0.004693, or about 1 in 213.