There are 10 orange counters and 4 blue counters in a bag. One counter is selected at random. What is the probability of NOT selecting a orange counter?
- 10 orange counters
- 4 blue counters
Choose the best answer.
Note
For a “not” event, count the outcomes outside the named event. This is the complement of the event.
- The complement of selecting orange is selecting any other color.
- There are 4 non-orange counters out of 14 total counters.
- So the probability is 4/14 = 2/7.
- A complement probability can also be found by doing 1 minus the probability of the event.
The correct answer is 2/7. This matches the calculation or definition, so students should focus on the reasoning rather than only memorizing the final value.