Question

A=(1,3,5.7,9) B= (2,4,6,8,10)C= (1,5,6,7,9)A intersects (B intersects C)=

Answer 1

$A=\{1,3,5,7,9\}\\ B=\{2,4,6,8,10\}\\ C=\{1,5,6,7,9\}\\\\ A \cap (B \cap C)=A \cap B \cap C=\emptyset$

Answer 2

$A \cap (B \cap C) =$

$= A \cap (\{2, 4, 6, 8, 10\} \cap \{1, 5, 6, 7, 9\})$

$= \{1, 3, 5, 7, 9\} \cap \{6\}$

$= \{~\}$