Question

What is the intersection og a b and c

Answer 1

Answer:

Intersection is an associative operation; that is, for any sets A, B, and C, one has A ∩ ( B ∩ C ) = ( A ∩ B) ∩ C. Intersection is also commutative; for any A and B, one has A ∩ B = B ∩ A. It thus makes sense to talk about intersections of multiple sets. The intersection of A, B, C, and D, for example, is unambiguously written A ∩ B ∩ C ∩ D .