Determine the intersection or union of sets A, B, and C as indicated,

Question

given   A = {5, 10, 15, 20}   B = {25, 30, 35, 40}   C = {10, 20, 30, 40}

.Find  A  U  C.

Answer 1

A U C = {5,10,15,20,25,30, 35,40}