Suppose two dice (one red, one green) are rolled. Consider the following events. A: the red die shows 1; B: the numbers add to 4; C: at least one of the numbers is 1; and D: the numbers do not add to 11. Express the given event in symbols. HINT [See Example 5.] B' D' O B'UD The numbers do not add up to 4, but they do add up to 11. OBUD' OBND O BIND How many elements does it contain? Enter an exact number.