If $A=\{1,2,3,4\}, B=\{3,4,5,6\}, C=\{5,6,7,8\}$ and $D=\{7,8,9,10\} ;$ find

$A \cup B \cup C$

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$A=\{1,2,3,4], B=\{3,4,5,6\}, C=\{5,6,7,8\}$ and $D=\{7,8,9,10\}$

$A \cup B \cup C=\{1,2,3,4,5,6,7,8\}$

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  • [JEE MAIN 2014]

State whether each of the following statement is true or false. Justify you answer.

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If $A$ and $B$ are two sets such that $A \subset B$, then what is $A \cup B ?$