Prove that every amount of postage n ≥ 24 cents can be made from a combination of 4-cent and 9-cent stamps. (Hint: You might need to prove the statement separately for n = 24,25,26,27 before attempting some sort of an induction proof.)

College Algebra (MindTap Course List)
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Chapter8: Sequences, Series, And Probability
Section8.5: Mathematical Induction
Problem 35E
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Prove that every amount of postage n ≥ 24 cents can be made from a combination of 4-cent and 9-cent stamps. (Hint: You might need to prove the statement separately for n = 24,25,26,27 before attempting some sort of an induction proof.) 

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