Question

A U (Bintersectat C) A= 2 3 5 8 9 ) B = 6 7 8 9 11 ) C = 1 2 3 6 7

Answer 1

A={2,3,5,8,9}
B={6,7,8,9,11}
C={1,2,3,6,7}

B∩C={6,7}
AU(B∩C)={2,3,5,6,7,8,9}

Answer 2

$A = \Big\{2,3,5,8,9\Big\};\quad B = \Big\{6,7,8,9,11\Big\}; \quad C = \Big\{1,2,3,6,7\Big\} \\ \\ B \cap C = \Big\{6,7\Big\}\\ \\ \Rightarrow A \cup (B \cap C) = \Big\{2,3,5,8,9\Big\} \cup \Big\{ 6,7\Big\} = \Big\{2,3,5,6,7,8,9\Big\}$