There are 10 slate rocks, 11 pumice rocks, and 4 granite rocks randomly distributed in a certain field. If 2 rocks are chosen at random and without replacement, what is the probability that both rocks will be slate rocks?
Pick:  A) 3/20  B) 5/26  C) 7/34  D) 9/37  E) 11/49
10/25*9/24 = 3/20   The answer is 3/20.
<result>A</result>
There are 10 slate rocks, 11 pumice rocks, and 4 granite rocks randomly distributed in a certain field. If 2 rocks are chosen at random and without replacement, what is the probability that both rocks will be slate rocks?