Given that A bag contains $4$ red, $5$ black and 6white balls and a ball is drawn at random
to Find: Probability of getting a
(i) white ball
(ii) red ball
(iii) not black ball
(iv) red or white
So, Total number of balls $4+5+6=15$
(i) Total number of white balls in the bag is $6$
We know that the Probability = Number of favorable outcomes/ Total number of outcomes
Therefore, the probability of drawing white a ball $=6/15=2/5$
(ii) Total number of red balls in the bag is $4$
We know that the Probability = Number of favorable outcomes/ Total number of outcomes
So, the probability of drawing red a ball $=4/15$