Question

if A=3,6,9 12 15 18 21 ) B= 4,8,18,16,20) c = 2,4,6,8,10,12,16,) D, (5,10,15,20) find A-B Au(B-c) (B-c) U (c-D
​

Answer 1

Answer:

A-B={3,6,9,12,15,21};AU(B-C)={3,6,9,12,15,18,21}U{18,20}={3,6,9,12,15,18,20,21};(B-C)U(C-D)={18,20}U{2,4,6,8,12,16}={2,4,6,8,12,16,18,20}