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In a box there are red, green, and blue marbles. One marble is selected at a time, and then placed back in the box. If the probability of selecting a red marble in this way is 1/8, and the probability of selecting a green marble is 13/16, what is the probability of selecting a blue marble?
A bag contains 5 red marbles, 3 blue marbles, and 2 green marbles. All the marbles are identical in shape and size. If a single marble is drawn from the bag at random, what is the probability that it is either red or green?
The table below shows the number of books of different genres in a small library.
If one book is selected at random, what is the probability that it is a Science Fiction book? Give your answer as a fraction.
Each face of a 12-sided die is labeled with a number from 1 through 12, with a different number appearing on each face. If the die is rolled two times, what is the probability of rolling a 7 and then rolling a 3?