In which year the first operating system was developed

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In which year the first operating system was developed

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3) You suspect that your automatic modem dialer is not working correctly. Which of the following commands will manually dial the number 123-4567?

4) Suppose you had an incurable computer virus and decided to wipe out all the data and partitions on your hard drive and reformat. What is the order in which you must delete the partitions?

5) Which command is used to list out deleted files in DOS?

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