Probability of two draws without replacement
The first marble is not put back, so the second draw has fewer marbles. Multiply the two probabilities.
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A bag has 6 red and 3 blue marbles. Two marbles are drawn one after the other and the first is NOT put back. What is the probability that both are red? Write a fraction in lowest terms.
Answer: 5/12
A bag has 8 red and 3 blue marbles. Two marbles are drawn one after the other and the first is NOT put back. What is the probability that both are red? Write a fraction in lowest terms.
Answer: 28/55
A bag has 7 red and 5 blue marbles. Two marbles are drawn one after the other and the first is NOT put back. What is the probability that both are red? Write a fraction in lowest terms.
Answer: 7/22
Tip: The first marble is not put back, so the second draw has fewer marbles. Multiply the two probabilities.
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