Sack Lunches

 

A group of 10 students get onto a bus for a field trip and put their lunches into a cooler. Later in the day, at lunch time, the class sponsor reaches in, randomly grabs a lunch, and hands it to each student that arrives randomly.

Did anyone get their lunch?

 

Expain your reasoning ...

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Hint:

Suppose there were three students and three lunches. Generate the different possible combinations of students and lunches.

Students Lunches
1 1 1 2 2 3 3
2 2 3 1 3 2 1
3 3 2 3 1 1 2

 

 

Dr. Robert Sweetland's notes
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