Question: 4. (15 points) Let P(n) be the statement that a postage of n cents can be formed using just 4- cent stamps and 7-cent stamps.

4. (15 points) Let P(n) be the statement that a postage

4. (15 points) Let P(n) be the statement that a postage of n cents can be formed using just 4- cent stamps and 7-cent stamps. Use strong induction to show that P(n) is true for all n 2 18

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