Question

A glass jar contains $30$ red marbles. If a single marble is chosen at random from the jar, what is the probability that it is a blue marble?

• A. $1$
• B. $\frac{1}{30}$
  
• C. $30$
• D. $0$

Answer 1

The correct option is D $0$

Given,
Number of red marbles $=30$
Number of blue marbles $=0$


Let $\text{P(B)}$ denotes the probability of an event of drawing a single blue marble.

$\text{P(B)}=\frac{\text{Number of favourable outcomes}}{\text{Total number of outcomes}}$

In this case,
Number of favourable outcomes $=0$
Total number of outcomes $=30$

$\text{P(B)}=\frac{0}{30}$

$\text{P(B)}=0$

The probability of choosing a blue marble from a jar of $\text{30}$ red marbles is $\text{0}$.

$\therefore$ Option (d.) is the correct answer.