In a bag there are 10 black balls,8 white balls and 5 Red balls.Three balls are chosen at random and 1 is found to be black. The probability that rest 2 are white is. Find the probability that remaining 2 are white :-
a) 8/23 b) 4/33 c) 10.8.7/23.22.21 d) 4/23 e) 5/23
Thanks in advance.