SOLUTION: A teacher is teaching a class about probabilities. She shows the learners a bowl which contains 3 Red marbles, 5 Blue marbles and 7 Yellow marbles. One of the learners, Vusi, is as
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Question 1023859: A teacher is teaching a class about probabilities. She shows the learners a bowl which contains 3 Red marbles, 5 Blue marbles and 7 Yellow marbles. One of the learners, Vusi, is asked by the teacher to select one marble out of the bowl at random and to hand it to her. She shows the class that Vusi chose a Blue marble and she demonstrates to the class how to calculate the probability of this outcome. While holding on to the first marble, she asks Vusi to select another marble in the same way. She now asks the class to calculate the probability that both the fist and the second marble chosen by Vusi would happen to be Blue.
Answer by FrankM(1040) (Show Source): You can put this solution on YOUR website!
There are now 4 blue and 10 not-blue
The odds of picking another blue is 4/14 or 2/7.
The first pick was already done, had she asked the question before that pick, the answer would be
There are 5 blue and 10 not-blue.
The odds of picking a blue is 5/15 or 1/3. then multiply by 2/7 for second pick, 2/21 to pick 2 blues at start of experiment.
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