Where Is A A ?

Probability Level 2

Let A A and B B be two sets. We have that A ∪ B = B A \cup B = B . Which of the following is necessarily true?

None of the other answers A ⊂ B A \subset B A = B A = B A ∈ B A \in B A = ∅ A=\emptyset

Ervin Tronati by Ervin Tronati , 22, Italy

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1 solution

Bibhor Singh
Jun 16, 2018

I have solved it with the help of Venn diagram.

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