please show your work

possibly base theorem. Please show your work.

Tinfirencises 16 through 18 , verify Theorem 2 for the given sets. 16. (a) A=(1,2,3,4),B={2,3,5,6,8} (b) A={1,2,3,4},B={5,6,7,8,9} 1inixencises 16 through 18 , verify Theorem 2 for the given sets. 16. (a) A={1,2,3,4),B={2,3,5,6,8} (b) A={1,2,3,4),B={5,6,7,8,9} 17. (a) A={a,b,c,d,e,f},B={a,c,f,g,h,i,r} (b) A={a,b,c,d,e},B={f,g,r,s,t,u} 18. (a) A={xx is a positive integer