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OpenStudy (anonymous):
It takes 3 straws to build the top triangle, 5 straws to build the 2 adjoining triangles, and 7 straws to build the 3 adjoining triangles. If the last row that you build has 25 adjoining triangles, how many straws did it take to construct the rows?
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OpenStudy (liliakarina):
3 straws to build one triangle, 5 for two, 7 for three. Do you see? Increases 2 for every triangle.
OpenStudy (liliakarina):
13
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