What is the probability of drawing 1 red marble out of a bag containing 4 red marbles, 3 green marbles, 2 blue marbles, and 1 purple marble?

There are 4 red marbles and 10 marbles total (4 + 3 + 2 + 1). The probability of drawing a red marble is 4/10, which simplifies to 2/5. Therefore, the correct choice is 2/5.

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