Suppose a jar contains 3 pens: 1 red, 1 blue, and 1 green. Three people sign a

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Suppose a jar contains 3 pens: 1 red, 1 blue, and 1 green. Three people sign a document, one at a time. Each person selects a pen, signs the document, and then replaces the pen before the next person selects a pen at random. Find the probabilities in Problems 23-26.

Exactly one person uses the red pen.

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