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peterblessd6868
11.07.2019 •
Mathematics
Abag contains 9 marbles, of which 3 are red and 6 are blue. players 1 and 2 take turns drawing marbles from the bag without replacement until a red marble is drawn.
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Ответ:
Solution:
For the first marble chosen by the player1,
The probability that the marble is red is 3/9=1/3
After that the second player chose without replacement, there are 8 marbles left, of which 6 are blue. So the probability of the second one being red is 6/8 = 3/4.
Since the question is asking the probability of both events happening,
So we have to multiply the two probabilities.
So the answer is (1/3) * (3/4) = 1/4.
Ответ: