A sock drawer has three colors of socks: white, brown, and black
The probability of getting a black sock = 7/12
The probability of getting a white sock = 1/4
The probability of getting a brown sock = ?
Recall that the sum of all probabilities must be equal to 1
So, we can write

Substitute the given probabilities and solve for P(brown)

Therefore, the probability of getting a brown sock is 1/6
Option D is the correct answer.