Arithmetic series describe how many objects are in a collection that is growing by a fixed number of objects each time. A classic problem is using stacked objects, whether they be pipes or cans or rocks, and determining how many rows there are if we know how many total objects are used to build the pyramid. Here, we use the formula for an arithmetic series, or sum, to find the value of n, which represents how many rows were used. We also show how to check your work.
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