Answer:
A relation schema R is in 3NF if it is in 2NF and for every FD X --> A either of the following is true
► X is a Super-key of R.
► A is a prime attribute of R.
In other words, if every non prime attribute is non-transitively dependent on primary key.
► X is a Super-key of R.
► A is a prime attribute of R.
In other words, if every non prime attribute is non-transitively dependent on primary key.
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