9, A Mysterious number

This piece of information is from my son. From his maths book. Kind of interesting.


It has nothing to do with Seven, one of my favorite movie directed by Bryan Singer.


9 is a mysterious number. Do you know 9 is hidden in the birthday of every notable person in the world, past or present?


Take George Washington, America's first President, who was born on the 22nd. February 1732. Let us write his birthday as the number 2221732. Now rearrange the digits of this number to obtain another number, say 3227212. Compute the difference of these 2 numbers by substracting the smaller from the larger, as follows:


3227212 -2221732=1005480

Add the digits of the resulting number until we get a single digit number. In our example, we have:


1005480=1+0+0+5+4+8+0 =18 =1+8 = 9


We obtain 9!


If you carry out the above calculatioins using the birthday of any other notable person in the world, you are going to get 9.


Try out, and have fun!


Does this suggest a certain mysterious relationship between the birthdays of all human beings? Hmm....