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A bag of marbles contains 6 blue marbles, 2 yellow marbles, 4 red marbles, and 1 green marble. What is the probability of reaching into the bag and selecting a yellow marble? StartFraction 1 over 13 EndFraction StartFraction 2 over 13 EndFraction StartFraction 1 over 6 EndFraction StartFraction 2 over 6 EndFraction