57. In a black cloth bag, there are 40 socks that feel the same, differing only in color: 10 white, 12 red, and 18 black. Now, reaching into the bag to grab socks, the probability of getting at least one pair of socks (2 socks of the same color count as 1 pair) out of the 3 socks taken is $\qquad$ .
Answer: $\frac{193}{247}$