Question

If A ={11,21,31,41},B={12,22,31,32}
1)A'=?
2)A union B=?​

Answer 1

A U B = { 11,12,21,22,31,32,41}

Answer 2

A'={11-12,21-22,31-31,41-32}

A'={-1,-1,0,9}