A bag holds 3 red, 5 blue and 2 green marbles. One marble is drawn at random. What is the probability that it is red?
Answer and explanation
Correct answer: B. (3 red out of 10 marbles in all)
- Step 1: Count all marbles: . Step 2. Probability = favourable outcomes / total outcomes = . **Answer: . Why not the others:** The others compare red with only some of the marbles or treat the three colours as equally likely.
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