Describe on a high level as to how this happens

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I was hoping someone can describe on a high level as to how this happens.

Question - Let S be the set of positive integers that can be written as a sum of one or more 4's and/or 7's. For example, 7 ? S and 18 ? S (because 18 = 4 + 7 + 7)

Provide a recursive definition of S.

Reference no: EM13713799

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