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Consider 3 jointly discrete andom variables X,Y,Z whose joint PMF is given by p(x, y, z)=\left\{\begin{array}{cl} c(x y+x z+y z), & x=0,1, y=1,2, z=2,3 \\ 0, & \text { otherwise
} \end{array}\right. a) Find the constant c. b) Find pxz(x,z) c) Find E[x*z]
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