Computer Basic Information
An essential difference between the operating system that runs a typical desktop computer and the operating system that runs a typical PDA is that .......

the desktop OS can run several programs simultaneously whereas the PDA OS cannot.
the desktop OS manages hardware resources whereas the PDA OS does not.
the desktop computer has an OS whereas a PDA does not.
None of these
the desktop OS has a graphical user interface whereas the PDA OS does not.

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Computer Basic Information
The proper definition of a modern digital computer is

an electronic automated machine that can solve problems involving words and numbers
a more sophisticated and modified electronic pocket calculator
any machine that can perform mathematical operations
a machine that works on binary code
None of these

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