December 7, 2004
Zippy coincidence
Mark “Too Much Time on His Hands” Dionne writes, with reference to the zip code map:
Once upon a time my zip code and my social security number both started with the same three digits.
How many people have exactly the same SS number and (nine digit) zip?
I’m no mathematician — as I’m about to prove — but aren’t the odds of having them match 1 in 999,999,999? With a US population of 300,000,000, wouldn’t the odds of there being a current match be about 0.3?
Now, since I’ve never gotten a fact or a simple mathematical equation right, please enjoy yourself explaining how wrong I’ve gone. It’s on me!