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Mathematics, 07.03.2021 17:30 naomicervero

A match-seller arranges his matchboxes in a triangular pattern . He
continues until there are 11 matchboxes in
the bottom row of the triangle. How many
matchboxes are in the complete pattern?
​

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A match-seller arranges his matchboxes in a triangular pattern . He
continues until there are...
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