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I) 3 questions have four multiple choices a, b, c and d II) only one question...

I) 3 questions have four multiple choices a, b, c and d

II) only one question is true and false

Let X

denotes the number of correct answers for part (I) and Y denotes the number of correct answers in true/false part. Find the joint probability distribution function fX,Y(x,y)

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