Will we ever run out of them?
In: Mathematics
That is not how it works.
“QR code” just means “a set of rules for turning text into a picture and back again”.
If you put the words “Hello World” through those rules, the result will be a specific QR code. Anyone else who also puts those same words through those rules will also get the same picture.
There is nothing to “run out of”. That’s like saying “will we ever run out of numbers?”.
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