Use Mathematical Induction to show that any postage of at least 12 cents can be obtained by using 3-cent and 7-cent stamps.
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This satisfies the condition. Inductive step: Assume that any postage of k cents can be obtained using 3-cent and 7-cent stamps. We need to show that any postage of (k+1) cents can also be obtained using these stamps. Case 1: If we add a 3-cent stamp to a Show more…
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