Just curious. You pay electronically, and you get a string of numbers. My question, what is the likelihood for a person to type in the same serial number to say, top up their mobile credit? What is the range of probability electronic payment companies are using?Then, does electronic payment in China have longer serial number?
What probability methodology is electronic payment using?
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0Well, how many digits are there in the serial number? You also have a further combinatorial explosion if you include letters and other characters as well in the serial. – 2010-12-01