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A rose garden has 21 bushes in one row, 17 bushes in the next row, then 13, and so on. If there are 66 bushes
A rose garden has 21 bushes in one row, 17 bushes in the next row, then 13, and so on. If there are 66 bushes in the garden, in how many rows are they planted?
I know that the formula is a(n-1)d
I just don't know how to set it up.
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