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Some problems whose solutions involve the pigeonhole principle are at http://math.mit.edu/~rstan/s34/pigeon.pdfhttp://math.mit.edu/~rstan/a34/pigeon.pdf

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Some problems whose solutions involve the pigeonhole principle are at math.mit.edu/~rstan/s34/pigeon.pdf. http://math.mit.edu/~rstan/s34/pigeon.pdf

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Some problems whose solutions involve the pigeonhole principle are at math.mit.edu/~rstan/s34/pigeon.pdf.