Neco 2024 Data Processing Question 34
Practice objective / multiple choice question 34 from the 2024 Neco Data Processing examination.
A 4‑digit decimal data block \(d_{1}d_{2}d_{3}d_{4}\) is transmitted with a checksum digit \(C\) defined by \[C \equiv (d_{1}+d_{2}+d_{3}+d_{4})\pmod 9 .\] The five digits \(d_{1},d_{2},d_{3},d_{4},C\) are sent. During transmission exactly one digit may be altered, and the altered digit is equally likely to become any of the other nine possible digits. What is the probability that the error is detected by the checksum test? Express your answer as a reduced fraction.
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About This Question
This is Neco 2024 Data Processing Question 34. It is one of the objective questions from the 2024 Neco Data Processing examination.
Difficulty level: Medium .
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