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.

  1. 👍
  2. 👎
  3. 👁
  1. 1 + 2 + 2
    2 + 1 + 2
    2 + 2 + 1
    1 + 1 + 3
    1 + 3 + 1
    3 + 1 + 1

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