Computer Basic Information
Binary numbers need more places for counting because:

None of these
0's and 1's have to be properly placed
Binary base is small
They are always big numbers
0's and 1's can be added in front of them

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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 manages hardware resources whereas the PDA OS does not.
the desktop OS can run several programs simultaneously whereas the PDA OS cannot.
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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