A bag contains 3 red balls, 5 black balls and 4 white balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is:
(i) white?
(ii) red?
(iii) black?
(iv) not red?

Explanation

No.of red balls `= 3`
No.of black balls `= 5`
No.of white balls` =4`
Total no.of balls `=12`
(i)Probabilty(drawing white ball)`=4/12=1/3`
(ii)Probabilty(drawing red ball)`=3/12=1/4`
(iii)Probabilty(drawing black ball)`=5/12`
(iv)Probabilty(drawing not a red ball)`=1-1/4=3/4`