Question: 11. Is the following a joint probability density function? f (x1, x2, . . . , xn) = B exn if 0 < x1 <

11. Is the following a joint probability density function? f (x1, x2, . . . , xn) = B e−xn if 0 < x1 < x2 < ··· < xn 0 otherwise.

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