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A sequence of triangles is formed as shown,each triangle has one dot more on each side than the previous one. How many dots in total are used in the triangle with 358 dots on each side?

 

waffles  Apr 28, 2017
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With n dots on each side the total number is n + (n-1) + (n-2) → 3n -3

 

Just plug in 358 for n.

Alan  Apr 28, 2017

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