Key Concept: Problem-Solving
c) 4
[Solution Description]
First enumerate the sets: A = \{2,3,5,7\}, B = \{1,3,5,7,9\}, C = \{0,2,4,6,8\}. Then compute intersections: $A \cap B$ = \{3,5,7\}, $B \cap C$ = \{\} (no common elements), $C \cap A$ = \{2\}. Now take the union of these results: \{3,5,7\} $\cup$ \{\} $\cup$ \{2\} = \{2,3,5,7\}. The count of distinct elements is 4.
Your Answer is correct.
c) 4
[Solution Description]
First enumerate the sets: A = \{2,3,5,7\}, B = \{1,3,5,7,9\}, C = \{0,2,4,6,8\}. Then compute intersections: $A \cap B$ = \{3,5,7\}, $B \cap C$ = \{\} (no common elements), $C \cap A$ = \{2\}. Now take the union of these results: \{3,5,7\} $\cup$ \{\} $\cup$ \{2\} = \{2,3,5,7\}. The count of distinct elements is 4.