Question

If A = {3, 5, 7, 9} and B = { }, then $A\cup B$ is:

• A. A
• B. B
• C. B - A
• D. None of the above

Answer 1

The correct option is A A

Given :
A = {3, 5, 7, 9}
B = { }
$A\cup B$ = {3, 5, 7, 9} $\cup$ { }
= {3, 5, 7, 9}
= A