Question

a={1,3,7,4,9,12,14} b={2,15,16,18,1,9} c={1,4,6,8,10,12} determine A u B, A u C, B u C, B u A!

Answer 1

AuB= {1,2,3,7,9,12,14,15,16,18}

AuC= {1,3,4,6,7,8,9,10,12,14}

BuC= {1,2,4,6,8,9,10,12,15,16,18}

BuA=AuB= {1,2,3,7,9,12,14,15,16,18}