A.{a,b,c,d} B. {e,f} C.{b,a,c,d} D. {1,2,3,4} Sets_____and______are not equivalent and not equal: I say that it would be B and D. Is this rght?

This is right.

But please explain after attempting the previous question.
(http://www.jiskha.com/display.cgi?id=1244130642)