Solved

Use the Formula For $\mathbf{S}_{\mathbf{n}}$ To Find the Sum for the Geometric Sequence

Question 154

Multiple Choice

Use the formula for $\mathbf{S}_{\mathbf{n}}$ to find the sum for the geometric sequence.
- $1,-3,9,-27,81$

A) 121
B) -121
C) -61
D) 61

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