Suppose R= {1, 3, 5, 7, 9, 11, 13, 15, 17} and D= {3, 6, 9, 12, 15, 18, 21, 24, 27). What is
ROD?
{3, 9, 15)
{1, 5, 7, 11, 13, 17}
{1, 3, 5, 6, 7, 9, 11, 12, 13, 15, 17, 18, 21, 24, 27}
{6, 12, 18, 21, 24, 27}