There are 10 slate rocks, 15 pumice rocks, and 6 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?  Choose the correct option
A) 2/19 B) 3/31 C) 4/37 D) 5/41 E) 6/53
10/31*9/30 = 3/31   The answer is 3/31.
<result>B</result>
There are 10 slate rocks, 15 pumice rocks, and 6 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?