Question

Let A, B and C be three sets such that A∪ B= C and A n B = phi A=B=C​

Answer 1

A−B=(A∪B)−B

Again A−B=A−(A∩B)

Substituting A∪B=C in the first equation and A∩B=∅ in the second equation we have

A−B=C−B andA−B=A

Substituting the second equation in the first we have

A=C−B

Answer 2

Answer:

Step-by-step explanation:

Phi = (A U B) U C , (A n B) n C.