There are 8 red beads and 4 yellow beads in a bag. One bead is selected at random. What is the probability of NOT selecting a yellow bead?
- 8 red beads
- 4 yellow 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 yellow is selecting any other color.
- There are 8 non-yellow beads out of 12 total beads.
- So the probability is 8/12 = 2/3.
- A complement probability can also be found by doing 1 minus the probability of the event.
The correct answer is 2/3. This matches the calculation or definition, so students should focus on the reasoning rather than only memorizing the final value.