Question 23
Eight kangaroos stood in a line as shown in the diagram.
At some point, two kangaroos standing side by side and facing each other exchanged places by jumping past each other (without changing the direction it was facing). This was repeated until no further jumps were possible. How many exchanges were made?
At some point, two kangaroos standing side by side and facing each other exchanged places by jumping past each other (without changing the direction it was facing). This was repeated until no further jumps were possible. How many exchanges were made?