College Brain Teaser
Professor Winter’s answer key to a chemistry test was stolen during one of his chemistry classes. Only three students - Amos, Burt and Cobb - had the opportunity to steal the answer key.
Five chemistry classes had been held in the lab that week.
Amos attended only two of the classes.
Burt attended only three of the classes.
Cobb attended only four of the classes.
The professor conducted only three of the classes.
Each of the three students attended only two of the professor’s classes.
No two of the five classes were attended by the same group of students from the three students under suspicion.
Two of the three students, who attended one of the professor’s classes that the third student did not attend, were proven innocent of the theft.
Which one of the three students stole the answer key?
