List the elements in set 'A' and 'B'. The universal set U is the set of odd numbers less than 19. Set A is the factors of 15. Set B is the multiples of 3 less than 19.

$U = \{\text{Odd numbers less than 19}\}$
$U = \{1, 3, 5, 7, 9, 11, 13, 15, 17\}$

$A = \{\text{Factors of 15}\}$
The factors of 15 are the numbers that divide 15 exactly.
$A = \{1, 3, 5, 15\}$

$B