Question

A={1,2,3} and B = ∅. Then A∪B​

Answer 1

Answer:

AUB = {1,2,3,∅}

Step-by-step explanation:

A={1,2,3} B=∅

AUB={1,2,3,∅}

Answer 2

Step-by-step explanation:

A= {1,2,3}

A union B = {1,2,3}

where you get the symbols . I couldn't find out them