# If set A and B are such that $A\cap B= \phi$. Then which of the following is true? Option 1) $A\cup B= \phi$ Option 2) $A\cup B= A$ Option 3) $A\cup B= B\cup A$ Option 4) $A\cup B= B$

H Himanshu

As we learnt

COMMUTATIVE PROPERTY OF UNION -

A ∪ B = B ∪ A

-

Option 1)

$A\cup B= \phi$

Option 2)

$A\cup B= A$

Option 3)

$A\cup B= B\cup A$

Option 4)

$A\cup B= B$

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