A box contains 7 white cards, 5 purple cards, and 5 blue cards. If one card is chosen without looking, what is the probability that it is blue?
- 7 white cards
- 5 purple cards
- 5 blue cards
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 5 blue cards.
- Then count all possible outcomes: 7 + 5 + 5 = 17.
- Probability means favorable outcomes divided by total outcomes, so the probability is 5/17, which simplifies to 5/17.
The correct answer is 5/17. This matches the calculation or definition, so students should focus on the reasoning rather than only memorizing the final value.