Posted by **Ash** on Monday, February 25, 2008 at 5:30pm.

The positive integer 4 can be represented as a sum of 1's or 2's in

five ways, such as 1 + 2 + 1 and 1 + 1 + 2. Show all the ways that

the positive integer 5 can be represented as a sum of 1's or 2's.

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