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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?
A) 1/3
B) 7/22
C) 1/9
D) 7/66
E) 2/45
OA D
Source: GMAT Prep
A) 1/3
B) 7/22
C) 1/9
D) 7/66
E) 2/45
OA D
Source: GMAT Prep
