There are 9 black stickers and 6 green stickers in a bag. One sticker is selected at random. What is the probability of NOT selecting a green sticker?
- 9 black stickers
- 6 green stickers
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 green is selecting any other color.
- There are 9 non-green stickers out of 15 total stickers.
- So the probability is 9/15 = 3/5.
- A complement probability can also be found by doing 1 minus the probability of the event.
The correct answer is 3/5. This matches the calculation or definition, so students should focus on the reasoning rather than only memorizing the final value.