Calculate PX,Y (0, 1) if px,y,z(x, y, z) = 3-x-y-z ( ) ( ) ( )

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PX,Y (0, 1) if px,y,z(x, y, z) = 3-x-y-z ( ) ( ) ( )² · () ³-*-y-² for x, y, z = 0, 1, . 3. 3! x!y!z!(3-x-y-z)! 2, 3 and 0≤x+y+z≤