There are 8 white tiles and 10 green tiles in a bag. One tile is selected at random. What is the probability of NOT selecting a white tile?
- 8 white tiles
- 10 green tiles
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 white is selecting any other color.
- There are 10 non-white tiles out of 18 total tiles.
- So the probability is 10/18 = 5/9.
- A complement probability can also be found by doing 1 minus the probability of the event.
The correct answer is 5/9. This matches the calculation or definition, so students should focus on the reasoning rather than only memorizing the final value.