A bag contains five red marbles and five blue marbles. You randomly pick a marble and then return it to the bag before picking another marble. The first marble is red and the second marble is blue.
a. 1/4 = 0.25 *****
b. 21/55 = 0.382
c. 1/17 = 0.059
d. 14/55 = 0.255

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  1. What is the question?

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  2. That was the whole problem It does not make sense to me because it does not ask a question.

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  3. Maybe the question is: What is the probability of getting a red marble first and then a blue marble second?

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  4. There are a total of 10 marbles.
    The probability of getting a red marble 5/10 = 1/2.

    Then you put that red marble back, so the total is 10 marbles again.
    The second try, the probability of getting a blue marble 5/10 = 1/2.

    When you want to know what the probability of two events happening one after the other, you multiply each events probability.

    The probability of getting a red marble AND THEN a blue marble: 1/2 * 1/2 = 1/4

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  5. Thank you

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  6. You're welcome!

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