Question: 4. Recursively defined sets (3 points) Give a recursive definition of the set below. The set of positive integer powers of 5. 5. Divisibility (4

4. Recursively defined sets (3 points) Give a recursive definition of

4. Recursively defined sets (3 points) Give a recursive definition of the set below. The set of positive integer powers of 5. 5. Divisibility (4 points) Prove that if a b and ba, then a = b or a = -b

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