Question 8
Explorer Bob finds the cave exit blocked by these rocks.
One punch destroys a striped rock; a checkered rock needs two punches, becoming striped after the first.
A rock falls when both rocks supporting it have been destroyed.
Bob escapes after 8 punches. Which picture shows the exit then?
One punch destroys a striped rock; a checkered rock needs two punches, becoming striped after the first.
A rock falls when both rocks supporting it have been destroyed.
Bob escapes after 8 punches. Which picture shows the exit then?