Discussion
A bag contains 3 red and 2 blue marbles. A marble is drawn at random. The probability of drawing a black ball is :
Answer: C
The bag holds only red and blue marbles, so a black one cannot be drawn at all.
\[ P(\text{black}) = \frac{\text{number of black marbles}}{\text{total marbles}} = \frac{0}{5} = 0 \]
An event that cannot happen is an impossible event, and its probability is exactly zero.
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