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UKMT Intermediate Mathematical Challenge, 2020

Geometry Difficulty 2.0 Junior Find the answer United Kingdom

Four of the following coordinate pairs are the corners of a square. Which is the odd one out?

(A) $(4, 1)$ (B) $(2, 4)$ (C) $(5, 6)$ (D) $(3, 5)$ (E) $(7, 3)$

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