Each student in a classroom has chosen either a green, red, or blue marble and written their initials on it. In addition, some of the marbles have the letter A written on them, and some of the marbles have the letter B written on them. All of the marbles are shown below. All of the marbles are placed in a bag, and then one is randomly selected.
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A. The probability that the selected marble will have a B written on it is ___ .

B. The probability that the selected marble will be green is points ____.