Since there are 14 horses, 14 - 6 -5 = 3 are black.  
a) 3 out of 14 are black, so probability is 3/14 chosen horse will be black
b)  1 - 3/14 = 11/14 probability will not be black
c)  6 are brown and 3 are black, so 9/14 probability chosen horse will be either.
Please mark me as brainliest :)