A box contains 5 red counters, 5 black counters, and 3 green counters. If one counter is chosen without looking, what is the probability that it is green?
- 5 red counters
- 5 black counters
- 3 green counters
Choose the best answer.
Note
For basic probability, compare the number of favorable outcomes with the total number of equally likely outcomes.
- Count the favorable outcomes first: there are 3 green counters.
- Then count all possible outcomes: 5 + 5 + 3 = 13.
- Probability means favorable outcomes divided by total outcomes, so the probability is 3/13, which simplifies to 3/13.
The correct answer is 3/13. This matches the calculation or definition, so students should focus on the reasoning rather than only memorizing the final value.