An urn holds 4 red and 6 blue balls. Two balls are drawn without replacement. What is the probability that both are red?
Answer and explanation
Correct answer: A.
- Step 1: The first ball is red with probability . Step 2. The second is then red with probability , so the product is . **Answer: . Why not the others:** is the answer with replacement, is only the second draw, and is only the first draw.
Practise more Algebra, Functions, Geometry and Probability.
Free questions with an explanation for every one, and full timed Državna Matura (Montenegro) mock tests.