If a and b are two sets such that a contains b then what is a union b

1.	If a and b are two sets such that a contains b then what is a union b
Answer» Let A={1,2,3,4}and B={1,2}B subset A{1,2}belong to A or {1,2}belong to BAUB = {1,2,3,4}AUB = A If you can understood then tell me on this chat a

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