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 red ball.

• A. $\frac{1}{5}$
• B. $\frac{1}{3}$
• C. $\frac{1}{4}$
• D. $\frac{1}{12}$

Answer 1

The correct option is B $\frac{1}{3}$

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 $W$.

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

$=\frac{4}{12}$

$=\frac{1}{3}$