There are 10 yellow stickers and 9 black stickers in a bag. One sticker is selected at random. What is the probability of NOT selecting a black sticker?
- 10 yellow stickers
- 9 black 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 black is selecting any other color.
- There are 10 non-black stickers out of 19 total stickers.
- So the probability is 10/19 = 10/19.
- A complement probability can also be found by doing 1 minus the probability of the event.
The correct answer is 10/19. This matches the calculation or definition, so students should focus on the reasoning rather than only memorizing the final value.