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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Eduncle Best Answer
Step 1 : Determine Essential Element of Primary key from Given Functional Dependency,
Here A is essential
Step 2 : Calculate Closure of essential element
Closure (A) = ABCDE
Step 3 : Since, A can determine all elements of relation. So primary Key is A.