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UKMT Grey Kangaroo, 2020

Combinatorics Difficulty 2.0 Junior Find the answer United Kingdom

Sophia has 52 identical isosceles right-angled triangles. She wants to make a square using some of them. How many different-sized squares could she make?

(A) $6$ (B) $7$ (C) $8$ (D) $9$ (E) $10$

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