In a department, 24 employees know typin...

In a department, 24 employees know typing and 11 know stenography, 25 know to use a computer. 7 know both typing and stenography, 4 know stenography and computers, 12 know typing and computers and 3 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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