Question

U= {1,2...,10}

A= {2,3,5,7}
B= {2,4,5,7}
D= {1,2,5,7}
Find:
1. A U B U D
2. A n B n D

Answer 1

1) {5,7}

2) {1,2,5,7}

Explanation:

1) A union B union C

means you take common contents in all A,B,C

2) A and B and C

means you take all the contents of all A,B,C and combine