Question 13
Seven animals stand in the line shown.
An animal can jump over any shorter animal. When its name is called, it successively jumps over all shorter animals immediately ahead of it. What is the minimum number of animals that must be called to obtain increasing height from the back of the line to the front, which is left to right in the picture?
An animal can jump over any shorter animal. When its name is called, it successively jumps over all shorter animals immediately ahead of it. What is the minimum number of animals that must be called to obtain increasing height from the back of the line to the front, which is left to right in the picture?