The table shows the total cost of purchasing x same-priced items and a catalog.
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This is a geometric series with first term 2 and common ratio -4. The general term of such a series (an) in terms of the first term (a1) and common rato (r) is written as
an = a1*r^(n-1)
The sum is the sum of such terms.
an = a1*r^(n-1)
The sum is the sum of such terms.