Answers

2015-06-26T20:09:40+05:30
A = {4,5,6}
B = {7,8}

A U B = {4,5,6} U {7,8} = {4,5,6,7,8}
B U A = {7,8} U {4,5,6} = {7,8,4,5,6} = {4,5,6,7,8}

So A U B = B U A
0
2015-06-27T13:47:20+05:30
A= {4,5,6}; B={7,8}A U B={4,5,6,7,8
B n A=Ф
The given statement is wrong, i.e (AUB) \neq (BnA).
Rather 
(AUB)` = (BnA).
or AUB=BUA.
0