Find the number of elements in each of the following sets.

$\displaystyle {U}=$
$\displaystyle {A}'=$
$\displaystyle {A}'\cap{B}=$
$\displaystyle {\left({A}\cap{B}\right)}'=$
$\displaystyle {\left({A}\cup{B}\right)}'=$
$\displaystyle {A}'\cap{B}'=$