Question: a) Which amounts of postage can be formed using only 5-cent and 9-cent stamps? b) Prove the conjecture you made using mathematical induction. c) Prove

a) Which amounts of postage can be formed using only 5-cent and 9-cent stamps?
b) Prove the conjecture you made using mathematical induction.
c) Prove the conjecture you made using strong induction.
d) Find a proof of your conjecture different from the ones you gave in (b) and (c).

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