Question

A bag contains 5 white balls, 4 red balls and 3 green balls. A ball is drawn at random. Find the probability that it is a green ball.

• A. $\frac{1}{5}$
• B. $\frac{1}{4}$
• C. $\frac{1}{3}$
• D. $\frac{1}{2}$

Answer 1

The correct option is B $\frac{1}{4}$

Total number of balls in the bag $5+4+3=12$.

We denote the event of getting a red ball as $R$, that of getting a green ball $G$, and that of getting a white ball as $W$.

$P\left(R\right)=\frac{\text{Number of outcomes which favour G}}{12}$

$P\left(G\right)=\frac{3}{12}=\frac{1}{4}$