Out of 150 students in a class, the number of students passing in Mathematics, Statistics and Economics were 50, 40 and 47 respectively. 15 passed in both Mathematics and Statistics, 14 passed in Statistics and Economics; 13 passed in Economics and Mathe- matics; 5 passed in all the three subjects. Find the number of students who failed in all the three subjects.
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13 students fail
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50
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