A basket contains 9 marbles. 4 are red and 5 are blue marbles If two marbles are drawn at random what is the probability that at least one ball is red.	Choose the correct option: A) 19/18 B) 17/18 C) 11/18 D) 13/18 E) 15/18
Total probability=9C2=36   4C2 +4C1*5C1=6+20= 
<gadget id="calculator">6+20</gadget>
<output>26</output>
26   therefore the probability that at least one of the red ball will be selected= 26/36=13/18   answer is 13/18
<result>D</result>
A basket contains 9 marbles. 4 are red and 5 are blue marbles If two marbles are drawn at random what is the probability that at least one ball is red.