SOLUTION: A flight of stairs has 12 steps. David can go up for 2 step or 3 steps each time. How many way(s) is / are there for David to go up the stairs?

Question 1146635: A flight of stairs has 12 steps. David can go up for 2 step or 3 steps each time. How many way(s) is / are there for David to go up the stairs?
Answer by Edwin McCravy(20060) (Show Source): You can put this solution on YOUR website!

We have to know more information.

Must David always take either 2 steps or 3 steps, and never take just 1 step?  Or
is taking just 1 step allowed?

He must get to the top of the steps.  Does the top of the steps count as the 
12th step or the 13th step?

Edwin

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