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Given:
Number of red marbles = 4
Number of blue marbles = 8
Number of yellow marbles = 6
Number of green marbles = 2
To find:
The probability of getting a blue marble then a red marble, i.e., P(blue, red).
Solution:
Using the given information,
The total number of marbles = 4+8+6+2
= 20
Probability of getting a blue marble in first draw is
Maria selects a marble, puts it back and then selects a second marble. It means the total number of marbles remains the same.
Now, the probability of getting a blue marble then a red marble is
Therefore, the required probability P(blue, red) is .