Question

use the venn diagram and find the elements in the set $b$.

Explanation:

Step1: Define complement of B

$B' = U - B$, elements not in $B$

Step2: Identify universal set U

$U = \{1,2,3,4,5,6,7,8,9\}$

Step3: Identify set B

$B = \{1,2,3,4,7\}$

Step4: Calculate $B'$

$B' = \{5,6,8,9\}$

Answer:

$\{5, 6, 8, 9\}$