There are 15 slate rocks, 20 pumice rocks, and 10 granite rocks randomly distributed in a certain field. If 2 rocks are to be chosen at random and without replacement, what is the probability that both rocks will be slate rocks?	Pick:
A) 1/3  B) 7/22  C) 1/9  D) 7/66  E) 2/45
Total No of Rocks = 45   Probability of choosing 1st Slate Rock = 15/45   Probability of choosing 2nd Slate Rock = 14/44 (Without replacement)   So combined probability = 15/45*14/44 = 7/66   So, ANSWER 7/66.
<result>D</result>
There are 15 slate rocks, 20 pumice rocks, and 10 granite rocks randomly distributed in a certain field. If 2 rocks are to be chosen at random and without replacement, what is the probability that both rocks will be slate rocks?