Question 9
Stephan has seven stacks containing a total of 8 white-covered books and 8 gray-covered books, as shown below.
He wants to rearrange them into two identical stacks. In each move, Stephan may place any entire stack on top of another stack to create a taller stack. Which picture below cannot be his final result?
He wants to rearrange them into two identical stacks. In each move, Stephan may place any entire stack on top of another stack to create a taller stack. Which picture below cannot be his final result?
