Required Mathematical Intelligence

Chapter 55 The student who stole the answer
One day, in a physics class taught by Professor Dim Witt, the answers to his physics quiz were stolen.Only three students, Amos, Bert and Cobb, had the opportunity to steal this answer.

(1) On that day, there were a total of five physics classes in this classroom.

(2) Amos only took two of the classes.

(3) Burt only took three of the classes.

(4) Cobb only took four of the classes.

(5) Professor Dim Witt only taught three of the lectures;
(6) All three students attended only two classes taught by Professor Dimwitt.

(7) The three suspected students appeared in different combinations in each of the five classes.

(8) In a class taught by Professor Dim Witt, two of the three students attended and one did not.It turns out the two students who came to the class didn't steal the answers.

Which of the three students stole the answer?
Next, applying (7) to all five lessons, the three possibilities 1, 2, and 4 are ruled out.According to 3 and (8), the two students who have nothing to do with stealing the answer must be Amos and Cobb (only one of the three classes taught by Professor Dim Witt was attended by two of these three students).So it was Burt who stole the quiz answers. ]
(End of this chapter)