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> Say there are 3E9 people on Earth, each with 3 cards. You vastly overestimate the number of people with credit cards.
by driverdan 11y ago
> Say there are 3E9 people on Earth, each with 3 cards.
You vastly overestimate the number of people with credit cards.
- scrollaway 11y agoIt averages out. The people who do have credit cards are issued far, far more than 3 numbers in their lifetime due to cards expiring/being cancelled, promotional offers etc. I myself have had something like 10-15 different card numbers in the past 10 years, without actually trying.
- wfunction 11y agoI wasn't trying to come up with a lower bound, I was trying to make the numbers round off nicely and reasonably to make a point.