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A bag contains 7 blue marbles, 5 red marbles, and 9 green marbles. A marble is taken at random from the bag. What is the probability that the marble is blue or red? Please type in your answer as a fraction.

  • math -

    Either-or relationships require adding the probabilities of the individual events.

    7/21 + 5/21 = ?

  • math -

    12/21

  • math -

    how many kinds of lunches are being served

  • math -

    7983

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