Computer Basic Information
Which is not necessary when using bar codes in supermarkets?

Point-of sale (POS) terminal
Price on the shelf
Price on the goods
Check digit on the bar code
None of these

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Computer Basic Information
Which of the following is true concerning personal computers?

None of these
Their future is not so bright owning to the improved cost-performance ratio of minis and mainframes
They have been most successful in the home
The electronic spreadsheet has been a primary reason for their popularity
They decrease the demand for mainframe computers

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