Question

If A = {1, 2, 3, 4} and C $\cap$ B = {a, b, c, d}, then (A $\cap$ B) $\cap$ C is

• A. {a, b, c, d, e}
• B. {1, 2, 3, 4}
• C. {a, b, c, d, e, 1, 2, 3, 4}
• D. Null set

Answer 1

The correct option is D Null set



$(A\cap B)\cap C=A\cap (B\cap C)=A\cap (C\cap B)=$ {1,2,3,4} $\cap$ {a,b,c,d} = {}