There are 3 green beads and 10 purple beads in a bag. One bead is selected at random. What is the probability of NOT selecting a green bead?
- 3 green beads
- 10 purple beads
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 10 non-green beads out of 13 total beads.
- So the probability is 10/13 = 10/13.
- A complement probability can also be found by doing 1 minus the probability of the event.
The correct answer is 10/13. This matches the calculation or definition, so students should focus on the reasoning rather than only memorizing the final value.