Question

If set A=(3, 4, 7, 9) and set B = {8, 9, 10, 11), then AUB isO [3, 4, 7, 8, 9, 10, 11)O (9)O [3, 4, 7, 8, 10, 11)

Answer 1

Given:

$\begin{gathered} A=\lbrace3,4,7,9\rbrace \\ B=\lbrace8,9,10,11\rbrace \end{gathered}$

To find:

$A\cup B$

Explanation:

We know that,

The union of two sets is a set containing all elements that are in A or in B.

So, the union of the two sets is,

$\begin{gathered} A\cup B=\lbrace3,4,7,9\rbrace\cup\lbrace8,9,10,11\rbrace \\ A\cup B=\lbrace3,4,7,8,9,10,11\rbrace \end{gathered}$

Final answer:

The set is,

$A\cup B=\lbrace3,4,7,8,9,10,11\rbrace$