Question 6
Maria must cross a stream using eight stepping stones. Each jump moves forward by one or two stones. She never goes backwards and does not land on the sixth stone, where a turtle is sitting. How many different jump sequences can she use to cross?
Editorial clarification: the worked solution uses banks at positions 0 and 9 and stones at 1–8, with jumps of one or two positions.
Editorial clarification: the worked solution uses banks at positions 0 and 9 and stones at 1–8, with jumps of one or two positions.