Question: If p(x, y) is the joint probability density function of random variables X and Y, what does the double integral of p(x, y) over [0,

If p(x, y) is the joint probability density function of random variables X and Y, what does the double integral of p(x, y) over [0, 1] × [0, 1] represent? What does the integral of p(x, y) over the triangle bounded by x = 0, y = 0, and x + y = 1 represent?

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