2. Let f(x₁, X2, X3, X4) be the joint density function of (X₁, X2, X3, X 4). Then the joint density of (X3, X 4) is obtained from f(x₁, X2, X3, X4) by integrating x, and x2, over the Cartesian plane. True or False. Circle one. Provide reason for the answer.

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