1 votes 1 votes F={AB->C,A->B} FIND EXTRANEOUS ATTRIBUTE ?? Databases databases database-normalization made-easy-workbook + – amit166 asked Oct 31, 2018 • edited Mar 3, 2019 by Aditi Singh amit166 236 views answer comment Share Follow See 1 comment See all 1 1 comment reply kumar.dilip commented Oct 31, 2018 reply Follow Share Here in AB -> C, B is Extraneous Attribute. Closure of (A)+ = ABC and Closure of B+ = B only.Without B, we can still can get the closure of A as ABC. A -> C , A -> B 0 votes 0 votes Please log in or register to add a comment.