plseee need it urgently

Question

loser66 · Answer

does it have another part? prove or disprove? or just prove? because if you say "prove", that means the statement is true and you have to prove it. Otherwise, if you say "prove or disprove", that means that statement can be true or false. If it's true, prove it. If it's false, give a counterexample. I want to make clear about the problem

anonymous · Answer

this is the statement given only
no another part is given

loser66 · Answer

to me, the first statement is false and I can give out the counter example for that. Therefore, I can't prove it is true. |dw:1368562388689:dw|
how B =C although the overlap parts with A are the same?

loser66 · Answer

the same with part b) So, cannot prove them .
let hear others' opinions. Me done.

anonymous · Answer

okay

loser66 · Answer

@amistre64

amistre64 · Answer

the power set is a "group"; and cancellation laws are effective in groups

amistre64 · Answer

or is that only abelian groups?

amistre64 · Answer

for set proofs, we take an element and see of its in both sets

amistre64 · Answer

let x in AnB,  then x in A and x in B
                   etc ....

amistre64 · Answer

if AnB = AnC  and B not= C,  then x not in AnC

x cant be and NOT be in equal sets, which is proof by contradiction