Use the principle of strong mathematical induction to prove that if $n\in\mathbb N, n\geq12$ , then there exist non-negative integers $x$ and $y$ such that $n=4x+5y$.
Strong mathematical induction to prove $n=4x+5y$
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discrete-mathematics
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1I suggest this should be closed as a duplicate. All you have to do is search for "postage stamp". – 2012-11-15