SDA multiple-choice final exam consist of 14 MCQ questions, each with 3 possible answers, out of
which only one choice is correct. A carefree student named Usman knows nothing about the exam
and will attempt the exam by pure guess. The student gets 1 mark for each correct answer and -1
mark for each wrong or un-attempted answer. The student has to attempt all questions for the exam
otherwise he will be disqualified. Usman needs 12 marks to pass the exam.
Find the probability that Usman will pass the exam.
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