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Mathematics 18 Online
OpenStudy (anonymous):

This diagram shows part of a design made by using toothpicks to form triangles. The top level uses 3 toothpicks. The second level uses 6 toothpicks. The third level uses 9 toothpicks, and so on. If you decide to continue the design so that it has 7 levels, how many toothpicks do you need altogether?

OpenStudy (anonymous):

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