In a class of 79 students 41 are taking French, 22 are taking German. Of the students taking French or German, 9 are taking both courses. How many students are not enrolled in either course?	Choose the correct option.
A) 6
B) 15
C) 25
D) 33
E) 54
Formula for calculating two overlapping sets:   A + B - both + NOT(A or B) = Total   so in our task we have equation:   41 (french) + 22 (german) - 9 (both) + NOT = 79   54 + NOT = 79   NOT = 79 - 54= 
<gadget id="calculator">79 - 54</gadget>
<output>25</output>
25   So answer is 25
<result>C</result>
In a class of 79 students 41 are taking French, 22 are taking German. Of the students taking French or German, 9 are taking both courses. How many students are not enrolled in either course?