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The question is about probability statistics. I would like all the workings shown, and the correct answer too. 5. Find the number k if the

The question is about probability statistics. I would like all the workings shown, and the correct answer too.

5. Find the number k if the joint probability mass function of X, Y and Z is given by f(:c,y,z)=P(X=x,Y=y,Z=z)=k(x+y+z) form=1,2;y=3,4; 221,2

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