Assignment:
If postage stamps only had the denominations 5 cents and 7 cents, what amounts of postage could we buy? What if they were 3 cents and 5 cents? Or 15 cents and 18 cents? what generalizations can be made for stamp denominations m and n cent, where m and n are positive integers?
Provide complete and step by step solution for the question and show calculations and use formulas.