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First of all, a PIN number is an recursive phrase because the N in PIN stands for number! There are 10 PINs of 1 digit 10*10 = 102 PINS of 2 digits, 10*10*10 = 103 PINS of 3 digits, and so on. In all, that makes 11,111,111,110 PINs. Some of them, such as 0, 0000 or 1234 are very insecure, but security of the PIN is not relevant to the question.
The Pin entry calculator will create a code based on the your the last 4 digits of you card. This number will be different everytime, and the online banking will not let you use the code again
4 digits
It is usually 4 digits. Some banks offer pin numbers that are more than 4 digits long.
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