Question
Use a graphing utility to find the sum of each geometric sequence.$$\sum_{n=1}^{15} 4 \cdot 3^{n-1}$$
Step 1
The sum of a geometric sequence can be found using the formula: $$ S_n = a \frac{1 - r^n}{1 - r} $$ Where: - \( S_n \) = the sum of the first n terms - \( a \) = the first term - \( r \) = the common ratio Show more…
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