To prevent invalid data input, a bank added an extra number at the end of each account number and subjected the new number to an algorithm. this technique is known as: Check digit
Reason:
A check digit is a form of redundancy check used for error detection on identification numbers, such as bank account numbers, which are used in an application where they will at least sometimes be input manually. It is analogous to a binary parity bit used to check for errors in computer-generated data. It consists of one or more digits (or letters) computed by an algorithm from the other digits (or letters) in the sequence input.
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