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UKMT Grey Kangaroo, 2023

Combinatorics Difficulty 2.0 Junior Find the answer United Kingdom

Matchsticks can be used to write digits, as shown in the diagram. How many different positive integers can be written using exactly six matchsticks in this way?

(A) $2$ (B) $4$ (C) $6$ (D) $8$ (E) $9$

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