Frog staircase

---

---

UNDER COSTRUCTION, PLEASE SEE THIS POST IN RESERVE COPY

---

CLICK HERE

---

First saw this gem in PProblem SSSolving.

A frog must climb a 10 step staircase. He can hop up either one step or two steps at a time. How many ways are there for him to make it to the top?

Help

Hint

Start with smaller staircases and look for a pattern.

Answer

89 ways.