In a group of 58 students, each student is registered for at least one of three classes – History, Math and English. Twenty-five students are registered for History, twenty-five students are registered for Math, and thirty-four students are registered for English. If only three students are registered for all three classes, how many students are registered for exactly two classes? Pick one.
A) 20 B) 10 C) 9 D) 8 E) 7
Each student is registered forat least one of three classesmeans thatthere are no students who are registered for none of the classes.   Total = {people in group 20} + {people in group B} + {people in group C} - {people in exactly 2 groups} - 2*{people in exactly 3 groups} + {people in none of the groups}:   58 = 25 + 25 + 34 - {people in exactly 2 groups} - 2*3 + 0--&gt;{people in exactly 2 groups}=20   20nswer: 20
<result>A</result>
In a group of 58 students, each student is registered for at least one of three classes – History, Math and English. Twenty-five students are registered for History, twenty-five students are registered for Math, and thirty-four students are registered for English. If only three students are registered for all three classes, how many students are registered for exactly two classes?