A bag has 6 black balls, 4 red balls and 8 white balls. If two balls are drawn at random, then find the probability that it contains no black balls.
a) 5/8
b) 4/91
c) 1/33
d) 22/51
e) None of these
Sol:
Number of Non black balls = 4 + 8 = 12
Required probability =12c2/18c2= (12*11) / (18 *
17) = 22 /51
