There are 4 green stickers and 6 black stickers in a bag. One sticker is selected at random. What is the probability of NOT selecting a black sticker?
- 4 green stickers
- 6 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 4 non-black stickers out of 10 total stickers.
- So the probability is 4/10 = 2/5.
- A complement probability can also be found by doing 1 minus the probability of the event.
The correct answer is 2/5. This matches the calculation or definition, so students should focus on the reasoning rather than only memorizing the final value.