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3 ?
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@ Satbir

I also think the answer is 3 but the answer is given in test series 2 with the explanation.

R1 (A,B,C) , R2(A,D,E,F). since there is total participation and Partial FD (D --> EF) allowed in 1NF.

Really i am confusion with such type of questions and their solution in test series in this context.

PLZ anyone explain with a clear concept
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This might help

https://gateoverflow.in/3717/gate2004-it-73

See @Arjun sir's explanation.