To find the probability of picking either number 2 or number 3 from the sample space \( S = {1, 2, 3} \), we first need to identify the favorable outcomes.
The outcomes in the sample space are:
- 1
- 2
- 3
The favorable outcomes for our event (picking number 2 or 3) are:
- 2
- 3
There are 2 favorable outcomes (2 and 3) out of a total of 3 possible outcomes (1, 2, and 3).
The probability of picking a number 2 or 3 can be calculated using the formula for probability:
\[ P(\text{picking 2 or 3}) = \frac{\text{Number of favorable outcomes}}{\text{Total number of outcomes}} = \frac{2}{3} \]
Thus, the probability of picking number 2 or 3 is \( \frac{2}{3} \).