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The Pigeonhole Principle
Question: 2014 Fall Midterm - 6
1 . Consider a square with sides of length 3. Assume this square contains 10 points. Which of the following is true?
(a)
At least two of these $n$ points are at distance at most $1$.
(b)
At least two of these $n$ points are at distance at most $\left. 1 \middle/ \sqrt{2} \right.$.
(c)
None of the above.
(d)
At least two of these $n$ points are at distance at most $\sqrt{2}$.
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