Question: A master student attempted an exam that includes 20 MCQs , Each question has 4 possible options. The student knows the answer of 10 questions,

A master student attempted an exam that includes 20 MCQs , Each question has 4 possible options. The student knows the answer of 10 questions, he has no idea about the answer of the remaining 10 questions and thus he answered randomly, let X denotes the score of the total number of correct answer, find the PMF of X, what is P( X >15)

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