Question

Find the set anu u= {1, 2, 3, 4, 5, 6, 7, 8, 9} A = {3,5,6,7}

Answer 1

We are required to find AnU, In words A intersection U

This means we are to find the elements that are common in A and U

$A\text{ = }\lbrace3.5.6.7\rbrace$

$U\text{ =}\lbrace1,2,3,4,5,6,7,8,9\rbrace$

The common elements are 3,5,6 and 7. They are both in A and U

Hence,

$AnU=\lbrace3,5,6,7\rbrace$