Determine the following:
U= {a,b,c,d,e,f,g,h,i,j,k}
A= {a,c,d,f,g,i}
B= {b,c,d,f,g}
C= {a,b,f,i,j}
A' U B'= {a,c,d,f,g,i} U {b,c,d,f,g}
={c,d,f,g}
What did I do wrong?

Question

Determine the following: 
U= {a,b,c,d,e,f,g,h,i,j,k}
A= {a,c,d,f,g,i}
B= {b,c,d,f,g}
C= {a,b,f,i,j}
A' U B'= {a,c,d,f,g,i} U {b,c,d,f,g}
          ={c,d,f,g}
What did I do wrong?

anonymous · Answer

hmmm, looks like you did intersection, not union

anonymous · Answer

or am I misunderstanding?

anonymous · Answer

union would list the members from each set, not the ones that are in both

anonymous · Answer

http://en.wikipedia.org/wiki/Union_(set_theory)

anonymous · Answer

i.e. {a,b,c,d,f,g,i}