There is an ex which contains 4 questions as follow:
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 \ (f_X, _Y (x, y) \)
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