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$16$ natural numbers from $0$ to $9$, and square numbers: how to use the pigeonhole principle?
There are $16$ natural numbers placed next to each other. Each is a number from $0$ to $9$. These are in any order, and you can have as many repeats as you want (e.g. all $16$ numbers can be zero, or ...
Oct 3 '11 at 7:43
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