(i) White?
Total numbers of red balls = 3
Number of black balls = 5
Number of white balls = 4
Total number of balls = 3 + 5 + 4 = 12
Probability of getting a white ball is = Total number of white balls/Total numbers of balls
= 4/12
= 1/3
∴ Probability of a white ball is 1/3
(ii) red?
Total numbers of red balls = 3
Number of black balls = 5
Number of white balls = 4
Total number of balls = 3 + 5 + 4 = 12
Probability of getting a red ball is = Total number of red balls/Total numbers of balls
= 3/12
= 1/4
∴ Probability of a red ball is 1/4
(iii) black?
Total numbers of red balls = 3
Number of black balls = 5
Number of white balls = 4
Total number of balls = 3 + 5 + 4 = 12
Probability of getting a black ball is = Total number of black balls/Total numbers of balls
= 5/12
∴ Probability of a black ball is 5/12
(iv) not red?
Total numbers of red balls = 3
Number of black balls = 5
Number of white balls = 4
Total number of Non red balls = 5 + 4 = 9
Probability of getting a not red ball is = Total number of not red balls/Total numbers of balls
= 9/12
= 3/4
∴ Probability of not a red ball is 3/4
