6. Incorrect. The answer is true
not false. 'B - A' is a set
consisting of all elements of B that do not belong to A. Copper belongs to B
and to A so must be removed.
___________________________________________________________________________
6. Incorrect. The answer is true
not false. 'B - A' is a set
consisting of all elements of B that do not belong to A. Copper belongs to B
and to A so must be removed.
___________________________________________________________________________