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A fair die is rolled, and a random variable X is defined to be -1 if the result is a 1, 2 if the result is a 2 or a 3, and 5 if the result is a 4, 5, or 6

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A fair die is rolled, and a random variable X is defined to be -1 if the result is a 1, 2 if the result is a 2 or a 3, and 5 if the result is a 4, 5, or 6. Find the density function of X.