Question

A bag contains $3$ black, $4$ white and $5$ red balls. A ball is drawn at random. What is the probability that it is a non-black ball?

• A. $\frac{7}{12}$
• B. $\frac{9}{12}$
• C. $\frac{1}{12}$
• D. $\frac{1}{24}$

Answer 1

The correct option is B $\frac{9}{12}$

Total number of balls in the bag $=$ $3+4+5$ $=$ $12$
Total no. of non-black balls $=$ $4$ $+$ $5$ $=$ $9$
Probability of getting a non-black ball $=\frac{9}{12}$