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UKMT Intermediate Mathematical Challenge, 2022

Combinatorics Difficulty 2.0 Junior Find the answer United Kingdom

One hundred rectangles are arranged edge-to-edge in a continuation of the pattern shown. Each rectangle measures 3 cm by 1 cm. What is the perimeter, in cm, of the completed shape?

(A) $800$ (B) $700$ (C) $602$ (D) $600$ (E) $502$

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