A company has 50 employees, of which 22 studied accounting, 15 studied finance and 14 studied marketing. Six employees have done just two courses and only one made ​​the three courses. How many employees have no training?
Choose the correct choice from the following answers
A) A)7
B) B)9
C) C)10
D) D)11
E) E)26
Total employees=50   studied accounting=22   studied finance=15   studied marketing=14   6 employees have been double counted and one employee has been counted thrice.   Therefore employees who have received training=22+15+14-6-(2*1)   =51-8= 
<gadget id="calculator">51-8</gadget>
<output>43</output>
43   Employees with no training=50-43= 
<gadget id="calculator">50-43</gadget>
<output>7</output>
7   7ns=7
<result>A</result>
A company has 50 employees, of which 22 studied accounting, 15 studied finance and 14 studied marketing. Six employees have done just two courses and only one made ​​the three courses. How many employees have no training?