Discussion
There are 12 white balls, 8 red balls and 5 green balls in a basket. What is the probability that a ball drawn is either red or white ?
Answer: C
There are 12 + 8 + 5 = 25 balls in all, and 12 + 8 = 20 of them are red or white. The two events are mutually exclusive, so:
\[ P = \frac{12}{25} + \frac{8}{25} \]
\[ P = \frac{20}{25} \]
So the probability is 20/25, which is the third option. The options 12/25 and 8/25 are the probabilities of a white ball or a red ball alone, and 15/25 has no basis in the data.
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