In a department, 24 employees know typing and 11 employees know stenography, 25 employees know to use a computer, 7 employees know both typing and stenography, 4 employees know stenography and computers and 3 employees know all the three. If there were 50 employees in the department, find how many employees don't know none of the three jobs.

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answer is B.

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Detailed Solution

Total number of employees who know either typing Computer or stenography or two or three jobs. $= 8 + 9 + 12 + 4 + 3 + 1 + 3 = 40$

Number employees who do not know any of three jobs. = 50-40= 10

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