There are 12 slate rocks, 16 pumice rocks, and 8 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? Answers
A) 3/32
B) 7/64
C) 11/105
D) 15/127
E) 19/134
12/36*11/35 = 11/105   The answer is 11/105.
<result>C</result>
There are 12 slate rocks, 16 pumice rocks, and 8 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?