Question
Use a graphing utility to find the sum of each geometric sequence.$$\sum_{n=1}^{15}\left(\frac{2}{3}\right)^n$$
Step 1
The sum \( S_n \) of the first \( n \) terms of a geometric sequence with the first term \( a \) and common ratio \( r \) is given by: \[ S_n = a \frac{1-r^n}{1-r} \] where \( r \neq 1 \). Show more…
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