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18 October, 06:15

A newly made car will have a model number, a parts number, and a serial number. A model number is assigned by the manufacturer to identify each type of car. A parts number identifies one part of the smaller parts that make up the car. A serial number is unique to each car produced and identifies it.

Which relation is a function?

(parts number, serial number)

(model number, parts number)

(serial number, model number)

(serial number, part number)

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Answers (1)
  1. 18 October, 08:26
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    (parts number, serial number) - - - no because every part number is related with many serial numbers

    (model number, parts number) - - - no because every model number is related with many parts number

    (serial number, model number) - - - yes because every serial number can have only one model number

    (serial number, part number) - - - no because a serial number is related with many part numbers
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