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Thu has a bag with green marbles, blue marbles, and red marbles. For each part below, if the marble selected is replaced before the next marble is drawn, what is the probability that she will draw.  

  1. A red marble?

    Remember that probability can be written as a fraction:

    How many red marbles are there?
    How many total marbles?

  1. A red or a green marble?

    See part (a).

  1. An orange marble?

    See part (a).