Question

9) Let A and B are two sets such that A ⊆ B, then A ⋃ B= ______ *​

Answer 1

Step-by-step explanation:

let's take

A={1,2}

B={1,2,3}

Every element of A is on B

so A is a subset of B

that is A ⊆ B,

A U B ={1,2} U {1,2,3}

={1,2,3}

=B

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