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March 26, 2017

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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.

  • algebra - ,

    1 + 2 + 2
    2 + 1 + 2
    2 + 2 + 1
    1 + 1 + 3
    1 + 3 + 1
    3 + 1 + 1

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