Given that A bag contains $6$ red, $8$ black and $4$ white balls and a ball is drawn at random
to find: Probability that the ball drawn is not black
so, Total number of balls $6+8+4=18$
therefore, Total number of black balls is $8$
Thus, the total number of balls which are not black is $18–8=10$
We know that the Probability = Number of favorable outcomes/ Total number of outcomes
Hence, the probability of drawing a ball which is not black $=10/18=5/9$