The Fibonacci sequence is not the only one that is defined recursively. Learn how to solve combinatorics problems with recursion, and how to turn recurrence relations into closed-form expressions.

Which of the following is demonstrated by the diagram above:

How many ways are there to tile a 4'' x 2'' area?

Each time, he can only take a step to a neighboring cell, that moves him to the right.

How many ways does he have of reaching the honey in the last cell?

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