Can you solve it? A headful of PINs
by Alex Bellos from Science | The Guardian on (#638RR)
Strategies for security codes
UPDATE: You can read the solutions here
When it comes to choosing PIN numbers for our bank cards or our phones, the most popular numbers are the obvious ones , such as 1234, 1111, 1212 etc, according to what you read on the web.
Today's puzzle is about what is the best strategy when you choose the digits randomly.
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