What are the odds that (despite having different birthdays) my daughter (born November 16, 2006) and I (Feb 8, 1979) have had each consequestive birthday on the same day of the week, we were both born on a Thursday and every birthday thereafter has been the same day of the Week. My 18th was a Saturday, her’s will be a Saturday, my 30th was a Sunday, her’s will be a Sunday too. In fact every single year, her age and the day that her birthday lands on is an exact match for the day that my birthday was when I turned the same age. I imagine the odds of knowing somebody who coincides this way with yourself are quite high, combined with the fact that we are parent and child. I’d like to get a statistical figure of the likelihood or a ratio of how many times this can occur in any given combination of years between two people, is there a formula that suggests the number of years apart for these coincidences to possibly occur? such as every 9 years or a number of years divisible by 9 (27 in this case)
Many thanks all.
